I think the main attraction of feeder vs. flower is that a blossom produces a finite amount of nectar daily while a feeder 'produces' a constant supply. So visiting a feeder is usually less work with a bigger payout.

Actually none of feeders leak, except when it gets really hot then I think any of them will leak. As far as wasps go Ive been fighting them all summer too , thats where having more options helps the hummers out, either more feeders or more flowers that they will use or both. I dont have a lot of different flowers right now : guaranitica black and blue which is number one here[10] lady in red or any coccinia, subrotunda, cuphea david verity and all of these are used, plus the 10 feeders. There are many more good hummer plants , look it up for anyone interested. Now is the time to plan for next year.

My regulars that were here all summmer seemed to prefer the feeders versus the plants. They are long gone now, but the migrators are at the feeders alot but also the plants.

I have a hummzinger it is a little expensive and to feed they have to hover, though it does have a perch.

The one I like best is from First Nature. It does not leak, they can perch while eating, easy to clean & comes in 2 sizes 16 & 32 oz. I have one of each and you can find them at Walmart for under $5! Do not use their nectar though, ugh! Here is pic.

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I'm with lv6b in that flowers can "run out" of nectar and have to make more. Which is part of the reason hummers fight over feeders - they don't undertsand that the "big flowers" usually have enough for everyone.
That said - plant your beautiful flowers too. Hummers need the protein from the bugs they'll find to eat in them and it's a source of nectar in case your solution goes sour or runs out.
As to feeders leaking in hot weather - what happens is liquids and gases expand when heated. The air in the empty top of the feeder heats up, expands and has no where to go so it pushes nectar out of the feeder hence the "leaking". You can eliminate this by using a feeder that has a reservoir on the bottom instead. I like them because you can fill them half full so the hummers can reach the nectar and the wasps can't. So the bottom reservoir feeders solve multiple problems. The hummzinger is my favorite - it's a breeze to clean too.