“je n’aime autant pas” sounds weird. “je ne préférerais pas” is correct but I agree it does not have the same feeling as "I'd prefer not to". I suspect "I'd pr

“je n’aime autant pas” sounds weird. “je ne préférerais pas” is correct but I agree it does not have the same feeling as "I'd prefer not to". I suspect "I'd prefer not to" is somewhat difficult to translate in French. This is probably because in English, "not to" without repeating the verb / action feels natural but in French it would feel like something is missing. You could try "Je préfèrerais ne pas faire ça" but that does not sound great either. I would probably go for "Ça ne m'arrange pas" ("It isn't convenient for me").