Hi Barath
I guess you call strawberry guavas to the red Psidium catleyanum, and Lemon guavas to he yellow ones... is it so?
To me it all depends on the treatment and care you gave to those trees... if well watered I can get strawberry guavas as big and as sweet as the lemon guavas... and these P. longipetiolatum fruits can get to that size too if well cared for... you can see some pics of the fruits on my hand on the Forum discussion.
That is true that if left abandoned the strawbery guavas tend to produce smaller and less sweet fruits... but still very palatable anyway.
Cheers my friend