i have 2 ttypes
both are smaller and a bit seedy, but, to me, they are much better in flavor than the ones you mention.
one is a mexican cream (seedling i think?) the other is similar, but ha a bit of a lemon flavor also (very yellow skin)
Do you happen to know what variety the one is that tastes like lemon?
no, not sure
they sell the fruit at a mexican grocer here.
we have a huge latino community
they are soft and tasty, and a bit seedy, very much like my Mex cream.
maybe not quite as soft, and a more lemon flavor.
my guess is that its coming from a very small operation/grower.
no stickers etc...i think its psidium guava (plain guava)
and someone just found a seedling that taste good and planted it out.
i think guava seedlings produce fruit which is very close to the parent most of the time
with little variation, and once in a while someone finds a superior fruit
and starts to propagate it.
my guess is that there are hundreds, or thousands of these all over
especially in places like Mexico where its grown for food and planting by seed is just easier than grafting
especially in peoples yards.
My Mexican cream tree is from Mexico too.
i actually have 2 more types i hadnt mentioned.
1 is a red that tastes nice (first fruit was last week)
and a white thats a bit hard.
both from Home Despot (and they were mis-labeled)
neither come close to the Mexican cream types IMHO.