I was think about what would be the good medium to heavy class harasser. Among them only WiGE will have the possibility to be have 60 to 80t, and the others are around 50t.
The initial thought on them are...
Mech
Mobility - 6/9/6, or 5/8/7 if you have a Partial Wings would be the maximum possible value.
Accuracy - Not so good if you expect it to be jump all the times.
Durability - Good, indeed.
Target Acquisition - Not so bad, for you can change facing to any direction after a jump.
Also mechs can punch/kick the enemy if it gots the enemy in melee.
Hover
Mobility - It can hit 10/15 quite easily even with 50t.
Accuracy - Good.
Durability - Better than WiGEs perhaps, but worse than anything else.
Target Acquisition - Turret.
VTOL(Superheavy)
Mobility - The best among them.
Accuracy - Good.
Durability - Good, consider its fast movement and being airborne, although some rotor hits ruins its day quite easily. Also Superheavy VTOL is not so expensive despite of being Superheavy.
Target Acquisition - Turret.
WiGE
Mobility - Similar to Hover, but slower, and have to move at least some distance. However it can fly over the forest in a pinch, unlike Hover.
Accuracy - Good.
Durability - You can have up to 80t, but if you want to put at least cruise 7 it does not have much difference with Hover but is slower so it would be the worst.
Target Acquisition - Turret.
Also, it have very few canon designs.
LAM(AirMech)
Mobility - WiGE move with minimum of 9 cruise speed, and can opt to move less but keep flying if you want.
Accuracy - Same as jumping mech, and it can't choose not to jump(or it would be an easy prey). :(
Durability - Fragile than normal mechs, but better than anything else for it is still a battlemech.
Target Acquisition - Can't change facing on the weapon phase, so the worst among them. Although its good speed can make up the problem.
What do you think about them? What would be the best option on the most times? Well, on the earth-like atmosphere.