I'm not keen on the big black ones or the small round green ones.
The smaller-fruited long black, violet or stripy types are my favourite - I find them more tender but even more importantly in a poor year you will get a few fruits per plant - it may only be 100g in total but better than the big fat zero you get from the plants that would produce fruits that are 200g+ each - but fail totally.
Of course in a bad year you might be lucky to see even a flower...