When selecting blackjack tables, the key factors to consider are the game rules, the number of decks used, player and table limits. The best tables typically feature advantageous rules, such as 3:2 payouts for natural blackjacks and fewer decks, which reduce the house edge. Conversely, the worst tables often have unfavorable conditions like 6:5 payouts, multiple decks (especially eight-deck games), and stricter rules for splitting or doubling.