From the replies above, most have noted that:
A) 6-max ands 9-max don't really differ if you look at it from the perspective of downstream action. ie CO is CO...BTN is BTN...no diff.
B) A5o is at the bottom of our range here
So this gets some of us on the fence, some ready to play and others an easy fold.
So what might cause some of the callers to fold and some of the folders to call? (Note: This didn't way whether it was cash game or tourney. As I play tourneys, most of my comments are with these in mind, but some will apply across the board)
1. Stack Depth / Tourney Stage
When you are short stacked or mid to late game, you need to look after your chips a little more carefully than early game. Early game you may have little or no intel. Around bubble time, it will depend on the tourney and the table. I like stealing around the bubble, whereas many playres like to coast into the money and then get playful again. Proceed with caution.
2. Player Aggression
You should be gathering intel on all players. You should know the likelihood that a downstream player will call/3-Bet/Defend Blinds. In such cases, you might either choose to err on the side of caution and fold. But you cannot bluff a call-station and you cannot reason with a maniac.
3. Player Activity
If you have a HUD, VPIP will give you an idea of how much your opponents will voluntarily put chips into the pot. Broadly, where VPIP is 15 or below, I'll add a "Nit" label. Above and through mid 20-s I'll labbel them "Tight". Above and through 40 -- Loose. Above 40, "Fishy".
I will further label with Passive or Aggressive according to their actions.
When there are Nits and Tight Passives, I will tend to play/3-bet with A5o from CO (with no preceding action). They are more likely to fold or flat.
With Tight Aggressives I am more inclined to fold and wait for a better opportunity. I can avoid the discomfort of having to call a three-bet, a donk-bet and can avoid chasing post-flop.
The trouble with aggressives, even when they are bluffy, is that sometimes they have a hand. And I don't want to be the one paying them.
With Loose and Fish, you basically need to be able to win at showdown. Better off flatting or small bet running into these guys until you are confident you have the best hand. You'll need to pay attention post-flop. These players often play connectors, suited connectors, and almost anything suited -- especially early game.
Bet when you hit. Check when you don't. (Usually). Control the pot size until you have strength.
I'm sure there are other considerations...
But I've gotta run!
Cheers,
JT