I think it really depends on how much you want to play. I've seen some people talk about percentages, but I think a good idea is to take your total deposit and divide it by the number of times you want to play in a week, month, or day. It's easier to organize yourself that way.
That's organized if someone does that, I'm not counting through percentage but some specifics amount per week but I don't think there is any difference at all. And taking it from where is also about the percentage on how much they're willing to spend it. To me, I don't gamble with more than 5% of my salary or any allotted budget. It doesn't go more than $100 per week and sometimes that amount could stay up to a month or two and that shows what kind of gambler I am. A controlled and disciplined one but, sometimes I've got those days that I also become emotional and go blow my entire bi-weekly salary into a few bets especially into those games that I am hooked with.