Depends. If you want a certain character, go for the character relic. Beware, you're just as likely to get a gold out of those as you are normally. I personally go for the cheaper ones, because Im not picky about who I get. Ultimately, it's up to you. Your gems are yours, so spend them how you see fit. If you need money, use them for that. If you want a cerebella, wait until friday. If you don't care, buy a normal relic.