Withdrawals first, always.
Bonuses are nice enough, but they’re also where a lot of the noise is. I’d rather know the boring stuff up front: cashout limits, pending period, KYC timing, whether the payment method I used can also be used to withdraw, and how clearly the terms explain all of that.
Reviews are useful too, but I try not to overreact to one bad post. What matters is the pattern. If different players keep describing the same delay or support loop, that tells me more than the welcome offer does.