depends on the size of strips you plan to use if very narrow (1" or less) a smaller-4"-6" block looks good- for wider strips 1 1/2"=2" larger 12-14" blocks look good.
it also of course depends on how many rounds you want to make-
it's a very personal choice
prehaps you should trace out 2 or 3 different sizes on paper- color them and see what you like best.
personally i would make BIG Blocks! just because after 4-6 of them i am so over it---
making 22 pineapple blocks was the most boring/tedious sewing i've ever tortured myself with- and i will probably never make another one- but they are beautiful! just OMG tedious! at least for me- some people like that type of sewing- some of us make one block and want to do something different---that would be me :wink: