Sungold and Black Cherry are 2 varieties often recommended here. Personally I prefer the Gardeners Delight (aka Sugar Lump) and Sungold over Black Cherry.

Here are a couple of previous discussions on the best cherry varieties you might want to read - lots of recommendations in them.

Best Cherry Tomato?

Going all cherry - recommendations?

Dave

One that was recommended to me is the hybrid Sweet Baby Girl, seeds available from TGS. I have some sprouting now. It's also supposed to be an excellent container variety. Anyone familiar with SBG?

Have to agree with the Sun Gold and Black Cherry recommendations. Wonderful. Try this recipe using Sun Golds or a combo of Sun Gold+Black Cherry instead of red cherries.

Here is a link that might be useful: Garlic and Herb Tomatoes

I was very impressed with Sungold (2008 was my first year
with it). You have to get it at it's peak for full
sweetness. And there's enough fruit to experiment with
various stages of ripeness. SOme folks say it doesn't
taste good if it's
not fully ripe - I found it tart but not bad tasting. Also
a great size for snacking without getting it all over you -
it's a one bite... Black Cherry is a two biter for me -
therefore slightly less desirable in our house hold.
All that being said, Sungold is the sweetest tasting cherry I've had.

Although tomatoes taste very different in different parts of the country, I also think Gardener's Delight (aka Sugar Lump) is the sweetest, and I have tried growing about 20 different cherries throughout the years. Sungold is also very sweet, but fruity, so it's a different taste. I think Black Cherry is delicious, but "sweetest" it is not.

For me Sweet Baby Girl was insipid, and quickly "exited stage right."

My permanent cherries/grapes, chosen from my cherry "trials" for sweetness and uniqueness, are: Sun Gold, Black Cherry, Black Pearl, Gardener's Delight, Golden Honey Bunch, Green Grape, Sugary and Tami-G.

Carla in Sac

Sunsugar is the sweetest cherry I've grown. I love black cherry too, but it is not as sweet.

What about Isis Candy?

I grew Sweet Baby Girl last year and it was very sweet in my garden. The first few fruits were good but definitely got sweeter with time.

I am not making room to grow it again next season because I'm still experimenting - looking for a sweeter one...

I was not impressed with Isis Candy. But just my opinion.