Depends on who I am.
If I am a hothead and want to show off, Phoenix Hawk.
Duty and tradition above all. Enforcer. A solid design, but chosen for the tie o my father.
Bang for the buck. Victor, since the armor is a free upgrade. Having 4+ mechs, I am not sure that is really important to my family though, since we seem able to pay for it ourselves. A mech that is solid, and is unlikely to be thrown alone to the enemy but as a team of similar chose ranged thugs that want to mug the enemy. A grimmer approach to war. Still, being so near the enmey might not appeal to me that much.
Archer for the cautious commander. A long range mech that can close in with its 4 ML later on. Same principle that guides a Battlemaster, just smaller. I am unlikely to earn much glory in this machine, though, since I am in a fire support mech.
In the end, me being me, I would chose the Archer, but if I was the hero type the Enforcer or Victor would be my choice. The PHX is too dangerous for my own liking.