Expert vs. Strong player, where is the advantage?

[CrisBrown]

Hi All,

I couldn't think of a better forum in which to post this, so I'll try it here.

In Hold'Em (limit or deep-money PL/NL) in which betting round does the expert player gain the greatest edge over a strong-but-not-expert player?

The expert's edge lies in making better decisions, so it seems reasonable that that edge will be most significant when the decisions are the most difficult. When the decisions are obvious, the expert has no edge over the strong-but-not expert player, because even the strong-but-not expert player will reach the correct decision most of the time. The more complex and difficult the decisions, the greater the edge to the expert over the strong-but-not-expert.

So, in what betting round are the decisions most complex and difficult?

(1) Pre-Flop
(2) Flop
(3) Turn
(4) River

I'll save my opinion (and I'm not sure I've formed one) until I've seen what others have to say. Also, if you believe the answer changes depending on the structure of the game (limit, pot-limit, no-limit), feel free to give a different answer for each structure. However, for PL and NL, assume deep money (average stacks of 200xBB or more).

Cris