3...exf6 is more sound and more solid. Only time I might suggest 3...gxf6 is if you are in a final round, must win situation with Black and a draw is as good as a loss. Otherwise, not worth the risk.
QPG: Trompowsky Exchange Question
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Sep 23, 2019
0
#3
ThrillerFan wrote:
3...exf6 is more sound and more solid. Only time I might suggest 3...gxf6 is if you are in a final round, must win situation with Black and a draw is as good as a loss. Otherwise, not worth the risk.
All right, thanks for this insight! 
g....keep it simple.
3 Bxf6 gxf6 4 e3 c5
3 e3 c5 4 Bxf6 gxf6.
There isn't much to love about gxf6. The King's bishop hasn't a great place to go to, castling is complicated and delayed, all for the sake of a center pawn. The opening is a race for development, but gxf6 does not appear to help that objective.
Sep 25, 2019
0
#6
A very recent game Cramling-Wenjun (September, 2019), 0-1, where black played 3. gxf6:
http://www.chessgames.com/perl/chessgame?gid=1972105
Sep 25, 2019
0
#7
pfren wrote:
The reason is quite simple: Black will be able to chip at white's center with ...c5 without being saddled with an IQP.
Good explanation!
Sep 25, 2019
0
#8
pfren wrote:
I recently played this game against a lower rated opponent. I played all the natural opening moves, but sadly enough there was not much left to play about... White played passively nd Black could get something tangible a few moves before the end, but it was far from easy/obvious.
Panagiotis - Panayotis, when I glanced, I thought that U played with your younger brother. 
QPG: Trompowsky Exchange:
What do U prefer 3...exf6 or 3...gxf6 ?!? or what is better in your opinion ?!?