It doesn't matter what website you use. There are competent and incompetent people on all of them. It really comes down to "you get what you pay for" You're

It doesn't matter what website you use. There are competent and incompetent people on all of them. It really comes down to "you get what you pay for" You're either going to pay a decent amount for someone with a lot of experience, references, and past work to show, or you're going to take a gamble on someone with less work, and less references, but seems trustworthy and competent. If you're looking for long term staff, give them a small test project, see what they're capable of and make decisions from there. A "what website should I use" mentality is the worst approach you could possibly have when hiring.