Here in Florida guavas are not as popular as say mangoes because they're very susceptible to nematodes, and most soils are sandy and infested.
Most guavas here are air layers, not grafts. The smaller less sweet varieties are said to be more nematode-resistant, I'm trying the one that's supposed to be very resistant (cattleyanum) but it hasn't fruited yet. If it's not tasty I will just keep it as rootstock. Had a strawberry guava that was small, completely unimpressive taste but it died years ago, but it can also be due to shady spot it was growing in.
I grow several varieties and have posted tasting videos on them on my youtube channel. links below. Have been fruiting Barbie Pink and Tikal for several years, Tikal is less sweet of the two but generally they're very similar. Barbie Pink is huge and fruits pretty much all year round for me, no fruit flies in winter months so no need to bag, but in summer starting April-May they're ravaged and cannot be left without bagging. but the fruit is also a bit smaller and sweetness is less intense in winter, but sometimes there are exceptions.
My Barbie Pink is a happy tree, growing in very calcareous soil that we were dumping to that area from pond digging, never thought it would be good for anything but the parent tree that was growing in "better" soil died, and this air layer has trippled in size its first year, and is going nuts. My wife is in love with Barbie Pink taste and doesn't want any other guavas, lol, to her it's the sweetest and best-tasting one because she says it tastes like strawberry cream from her childhood, extremely aromatic. For that size fruit, the seed component is not that bad and the seed containing core is actually the creamiest and sweetest part. I wouldn't scoop it out like Kaz did in his photo
I like guavas with a little bit of acidity and crunchiness and white varieties are more appealing to me, I procured a couple of very good varieties but air layers have been dying on me for some reason. So last 2 years I haven't been able to propagate.
Here are the tasting videos on different guava varieties from my garden, with the most impressive tasting fruit:
https://www.youtube.com/watch?v=VNjPCJFePyo&t=408s&ab_channel=OshoBodhisattvaMeditationGardenhttps://www.youtube.com/watch?v=S9bkJ-FqTlY&ab_channel=OshoBodhisattvaMeditationGardenhttps://www.youtube.com/watch?v=dlc8S4x6JEU&ab_channel=OshoBodhisattvaMeditationGarden