Understanding the why of a move

Hello, 

When I analyzed a game I came to this position:

r4rk1/pp1bqppp/3bpn2/n1ppN3/3P1BP1/2P1P2P/PPQNBP2/R3K2R w KQ - 0 13

Now, the engine (stockfish) shows about +1.22 advantage if dxc5. It shows the move g5 as about half the value (+0.78). When I was playing the game I looked at dxc5 as not a very good move because it disrupts my center control and opens up the c-file for Black. Can you help me understand the reasoning why dxc5 is a better move than g5?

Thanks for your insights.

Chris

I think dxc5 gives black some problems. For example, see above,

Yeah what corum said. It's not a positional move, it's a tactical one.  However, it isn't a bad positional move. It gives you a reversed slav pawn structure where you already have a blockade on the e pawn that isn't easy for black to solve. If you let black take then you have a choice between and orthodox exchange formation or a symmetrical pawn structure, the exchange formation gives black an easy plan and the symmetrical one probably gives you a slight edge because of your better pieces but with good play from black it should just be a draw.

You should really learn these pawn structures if you plan to play the London as your main weapon.