Based on your focus of Disease Resistance & Fragrance, then own-roots are best. Deep & long-stick Dr.Huey-rootstock doesn't do well in poor-drainage clay.

More than a decade ago Tammy in TN with over 1,000 roses noted that grafted-on-Dr.Huey doesn't do well in her red acidic clay and high-rain. I notice the same in my poor-drainage alkaline clay and heavy rain. Multiflora-rootstock from Palatine is a cluster-root and can take tons of rain better.

Dr. Huey-rootstock is best for dry climate and alkaline soil. I lost countless of roses grafted on Dr.Huey when acidic rain could not drain well in my zone 5a freezing & heavy rain and spring flash floods.

VIGOROUS own-roots can bounce back after drought or flood better. I'll rank below OWN-ROOT roses on fragrance and disease-resistance:

Peter Mayle - very vigorous and healthy as own-root & never see blackspots nor mildew as 6th-year own-root. The scent is amazing eucalyptus and rose, no other rose can smell like it. Narrow & tall & doesn't occupy much space. Bloom best in hot & dry above 90 F.

Buxom Beauty - Strong perfumy rose scent, glorious with many blooms in hot & dry but it's a blackspot mess & lost all leaves in rainy weather. WIMPY as own-root, can't survive many zone 5 winters like Peter Mayle. One needs both, since the colors and scents are different.

Yves Piaget: best as grafted & wimpy as own-root, best in hot & dry and alkaline clay.

Princess Charlene de Monaco: Fades to white in hot sun, plus less petals if hot & dry. It's HUGE as own-root in my zone 5, like 10 feet tall by 3 feet wide in late fall. Scent is worth buying, unique pear nectar and rose. Health is impeccable: NO mildew nor blackspots in its 6th-year.

Savannah: Only if you have room and plenty of rain. It's a huge bush at 6' x 4' as 8th-year-own root in my zone 5. A 10 in health with super-glossy foliage. Needs partial shade since it consumes ungodly amount of water. Blooms well in rainy climate, but stingy in hot & dry. Scent is nice, but far below Peter Mayle & Buxom Beauty & Princess Charlene's quality.

Low-thorn Poseidon is huge as 9th-year-own root, like 5' x 3'. It likes tons of rain water. One bush is enough since it gives tons of blooms. Scent is noticeable only in cold weather, but zero scent in hot weather. A 10 in health for rainy climate, but a 6 in health for dry climate (leaves turn yellow & drop off if too dry).

Low-thorn Sweet Mademoiselle: biggest rain-hog like Poseidon. Bush is huge as 6th-year-own-root at 6' x 3.5' wide. A 10 in health for rainy climate, but a 6 in health for dry climate (leaves turn yellow & drop off if too dry). Scent is myrrh and rose, blooms last very long in the vase. Needs soaking wet soil to bloom well, best in partial shade and high calcium & high potassium clay soil for its deep cup and many petals.

You absolutely need Bliss, she's amazing. Summer Romance won't bloom much at all for me 🤷‍♀️

I ordered Sugar Moon as a white rose, I think BenT recommended this rose.

For me, Savannah was lots of green and not so many blooms but for others I hear a diffrent story, Sweet Mademoiselle is really tall with nlooms up high. Bliss is a dream rose

I have 2 Bliss that only get afternoon sun at this time of year (late Spring) and they are very pale. A third one that gets morning sun is a much deeper and prettier colour.

My friend and I both got Summer Romance this year. It does not bloom well especially after spring

Sugarmoon is a gorgeous rose! 1 of my favorites but it did black spot here and succumbed to crown goal. It probably would do fantastic in a place such as California. Summer romance Prophets from a good Pruning after her 1st flush. This rose can grow into an absolute Monster flowering only on the tips or underneath where 1 can't even see them without This step. I still love this rose though.

Peter Mayle-the blooms were too…too.

Just a personal preference but the blooms were too big, too overblown, too blowsy, just too…much

Princess Charlene de Monaco-it is different from Bliss and both are must haves

Yves Piaget-really pretty, really fragrant, not super vigorous, lanky plant shape

Ballgown-don’t have

Summer Romance-fairly boring first two years and then really startled me this past summer with health, beauty and fragrance

Earth Angel-definitely worthy of two

Raspberry Cupcake-too new to evaluate but seems to have potential

PowerPuff Pink-don’t have

Savannah-large green monster is a good description-and blooms develop to being a flat disc

Poseidon-don’t have

Queen Mary 2- I really like this one. Pretty, healthy, fragrant. Worthy of a shot.

Sweet Madamoiselle- I like this one more than I thought I would. Very vigorous and blooms have more character and depth than I was expecting. BS resistance not great yet but I’m hopeful it will get better with age