what is the better gamble for pro players?

[JLimbs]

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The ratio of profit:variance is much better in NLHE than LHE, so your unlikely to go on as long/many downswings in NLHE

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In my experience this is generally true. I think the main reason for it is because you have less control over your money in limit. When you have an edge you are only able to bet according to the structure of the game.

In no limit its possible to get more money in the pot when you have an edge which serves as increased value as well as protection for your hand.

-Jerry