what does everyone think on the topic of credit cards vs. debit cards when making purchases? and which situations do they each have their advantages/disadvantages?

normally I have been buying everything with my credit card but ONLY if i have the money in the bank to afford them. not only do I get cash back because of it, i gain interest on the money in the bank during the grace period.

the thought on this topic came up because I have a gym membership that automatically bills me monthly, and I'm having a hard time deciding whether or not to actually charge my credit card or debit straight outta my bank account.