Red Dog Casino is still youthful, with barely two years in the business. The USA’s Best Online Gambling Sites Ranked 1. Best crypto welcome bonus – Wild Casino.Best mobile gaming experience – Super Slots.Best for blackjack and poker – Ignition.Before jumping into the full review, here is a list of the top scoring sites and what stood out about each. Unfortunately it’s not always easy to find sites that tick all these boxes, so for this review we’ve tested over 25 gambling sites and ranked them from best to worst. The best gambling sites should have essential features like a good reputation, great bonuses, fast payouts, fair odds, and an enjoyable overall gaming experience.