I started playing CN9s yesterday to get mastery for Mediums... my 4SP is waiting

The AI works quite good for me and I will get the A as my second one.
The kind of Centurion I want to keep is something with a big ballistic weapon, because I have all other kinds of mechs.
My first idea was this: CN9-A Gauss 2xML
It has medium range, enought speed and should be able to backup the team, but i haven't used a gauss in this game yet... so I'm not sure if it will be that good.
The other idea is a typical YEN-LO-WANG AC20 2xML build.
I wanted to play with an AC20 for a long time, but i didn't want an AC40 Jager or torso mounted guns... it should be able to play the same role as the one above, so the main issue is the price.
I have got 4k MC left and won't get any more in the next months.
So the question is: is the YLW worth spending my last MC on it to use an AC20 and not a Gauss?
Thanks for your advice
