i prefer j.ai bc it allows me to add things that i cant on c.ai (last time i checked, bc i havent uploaded on there in aaaages haha)

last i knew of it was pretty difficult to create characters that stayed true to how they're supposed to act and i in general just find that janitor ai lets you do a lot more with bot creation + people can customise their temperature and token limit to make the experience more customised to them.

i would recommend j.ai if you want to create bots for your own satisfaction and don't really care about interactions (in my personal experience it's harder to get popular), and c.ai if you would like your bots to be seen by more people

overall:
pros of j.ai vs c.ai:
j.ai limits you a lot less and you can do more with bots
customisable (i think j.ai's personas are much better than c.ai's)
j.ai has a lot of different options for ai models and the free JLLM is more sophisticated than c.ai's id say

cons of j.ai vs c.ai:
c.ai has a much bigger fanbase whereas j.ai is more niche and harder to come across
c.ai has voices (which is pretty cool)

hope this helped <3 ty for the question