Ares for the 

I'm biased because I love sniping, so I would say make the Panther stronger.

With that being said, my 2nd fave is the Ares with Arc 10+6.

It boils down to what you like using more, and if you want that to have more damage, or to have a secondary backup.

Redox. Oh wait, that's me.  I would use Ares with the upgrade so you can carry DL8.  I upgraded my Unicorn Lancer to hold on of my DL8.  Very amusing to watch actually when people are getting dropped by a jumping unicorn.

I'm rambling.

美洲豹

Panther all the way this is a no brainer. The shield wall helps your team you can create a protection from flanking. It doesn't care about getting shot. Ares is slow AF ez to out maneuver I'll own an Ares with tengu. Panther is a pain you have to strategize more it's not just a run and gun. Orion mark of death can't travel through it. Surge can fly through it but good luck going for the flank it is hands down better. O and ur stupid shield won't get shot and removed while behind cover and wasteful irritations like that. Ares is lame better tanks out there

I dont advice Ares, it's better to get Aegis than to rank up Ares.

Yea aegis is too good to pass up. Haha tho I don't have aegis yet.