[Colonel Kataffy]

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One part of me says to learn Omaha because of its relative similarity to hold'em

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I would probably argue that Hold'em is closer to Stud than it is to O8, just because both stud and Hold'em reward agression much mores so than O8.

I went through a phase myself when I got tired of hold'em where I tried 8 tabling O8, and it was easy as hell to beat, but my god was it boring. For that more than any other reason, I reccomend stud as a change of pace.