20/40 online would be bigger then 40/80 live. Probably be bigger than 60/120 I would say.
This is not true. Hearsay. A game being online doesn't make it bigger than a live game. Sometimes online *can* play slightly bigger (and I mean slightly, like 25% bigger) because people can sometimes be more aggro online, and games are often shorthanded more online than in live, which makes people see more flops. But that is not the rule, and you can't pigeon-hole online as always playing bigger than live games. And there's no way a 20/40 online plays bigger than 60/120 or 40/80 live. Zero chance. I play both, and I play live 60/120 at least 40 hours per week.
Just because of multi tables and faster hands per min plus the increased skill level of online players/information available.
None of this is true either.
Multi-tabling doesn’t make any game bigger. Neither does more hands per hour. Neither does increased skill level. Neither does information available.
“Multi-tabling” only gets you more more hands per hour. “More hands per hour” increases your long-term win-rate (assuming you’re a winning player) or makes you go broke sooner (if you’re a losing player). “Increased skill level” makes a game tougher to beat, as can “information available”.
As a 60/120 LHE pro, I find that what makes a game play bigger is when there are a lot of overly loose rec players in the game, who also happen to be very aggro and like to raise and bluff a lot, and jam with a wide range of cards, and when a lot of them are seeing a lot of flops. And then when they want to do a round of straddles, or put the KILL on.