I have bunch of the newly available species but none even close to fruiting, I think that will be the same story for most collectors on here. We just recently have gained (affordable and easy) access to so many new ones as a community. It's been great for me to experience this renaissance.
In my yard the best eugenias (and most are in pots):
1. Cherry of Rio Grande - CORG has now taken top spot eugenia in my collection. Dead nuts easy to grow, VERY robust, takes frost like a champ, and makes a LOT of fruit. My experience is you will need a couple different genetic examples flowering at the same time for great fruit set. They are super easy to cleft graft so just get a scion from someone else and graft up if you only have one plant.
2. Pitanga - probably my favorite flavor wise, but I've battled mites and fungal issues and my climate is just barely too cold for them. I wish I could say they grow well for me, but they just don't. Fruit set is always dependent on my weather and I get that one last snap frost or rain that dusts the flowers.
3. Cedar Bay - I can't say I love the fruit, but it's good enough to keep a few of them and it grows pretty well. It's far more edible than others.
4. Pitangatuba - I eat them out of hand just fine and I think they're worth having in the collection. Another really easy grower. I have some outside in the soil now and look forward to seeing them grow.
5. Calycina - I have these beside my CORGs and I believe the pollen from CORG works with it. Didn't get good production till it was beside my CORGs and now it fruits readily. I also grafted some other calycina scions on to ensure set but the scions haven't flowered yet.
6. Grumichama - I liked the flavor of those that I've tried but I just can't them to grow and fruit for me, even in my greenhouse. I think they're sensitive to PH and I'm on the wrong end. Anyways, worth growing if you can pull it off.
7. Repanda - VERY PRODUCTIVE. Fruits almost year round for me. They are just small and flesh clings to seed so not a lot to work with, but nice to just stand there and graze for awhile. Pretty tree and the blooms are insane.
I have also: octocostata, multicostata, beaurepariana, copacabensis, vericillata, black joinville, sellowiana, langsdorfii, anthropophaga, caipora, and a bunch of others I can't recall. Give me 3-4 years and I'll let you know.