Almost all that matters * in all casino games for "efficiency" is the return to the player - RTP. If you search for all games there is a maximum RTP available. I believe that the minimum RTP that we should accept as customers in any casino is of the order of 96%. In fruit this is also the most common from my experience. There are also fruits that rise above 97%.
In classic European roulette (especially if it has en prison / la partage rules) we have the best return. When we play quantum / fire blaze / age of the gods or whatever, at least in straight up we pay something more in the form of worse RTP. American there is no reason to play unless we are fighting over our money.
Respectively, we will find a relatively good return in other live games such as craps.
In Game shows plus morals the maximum payout is also around 96%.
The best return if we know a basic strategy, is with a difference in blackjack, that even with bad rules we have a return of over 99%.
In all this, pay attention to the side bets and in general to the choice that we will bet. Usually each option has different RTP with some reaching up to 90%!
Ok, we said fun but it is a shame to waste our money when there are equally good choices that cost us less.
* Because RTP is theoretical, for what will eventually be in our pocket at the end of the day, luck (obviously) matters, and what we call variability. In games with great variability we can play 100 times and not win a single eg if we play 0 in roulette every time. But once we win we will get a good return. On the contrary, if we play red 100 times, it will be very difficult to return home with 0 euros, but surely our maximum profit will also be the mediocre times we will win.