Best bot to rank up out of each of the classes

Tfpsoundwave

So i have a 4 star for each class, and was wondering which one i should rank up, and hopefully r5 one day.

Brawler:

Motormaster (Currently r3, should i r4?)
Grindor (r1)
Grimlock (r1)
MV1 Optimus (r1)

Scout

Only prowl

Warrior:

Bonecrusher (r4, should i rank 5?)
Hound (r1)
Bludgeon (r1)

Tactician:

G1 Megs (r2)
Ultra Magnus (r1)
Sharkticon (r1)
Starscream (r1)

Demolition:

Ramjet (r1)
Megatron rotf (r1)
Waspinator (r1)
Shark (r1)

Tech:
Wheeljack (r1)
Mirage (r1)
Shockwave (r2)
Rhinox (r3)

So who should i upgrade?

Gunz0

Brawler:
Motormaster if duped, otherwise MV1 Prime
Warrior:
Bonecrusher
Scout:
Hmmmmmm... tough choice
Tech:
Shockwave/Mirage
Demo:
Megs
Tact:
Megs

UrAverageMalaka

Tact: megatron
Demo: ramjet (unpopular decision but i like him)
Tech: shockwave
Warrior: bludgeon
Brawler: Mv1