Standard M4 front set VS G&P Defender front set ? ?

[ryan1796]

I'm debating whether I keep the standard M4 front or get a G&P Defender front.

Reasons why I want to change;
-make my gun more durable
-minimize the wobble
-lot of room to customization

So my question is, does G&P Defender front set will satisfy my goal?

Also, does anybody know which front set is longer? and what barrel length I should use with the G&P Defender? I have a QD silencer so you can add about 170mm up.