I love them both now after looking more carefully
Mk-I
1) Hard Driver mode looks very cool
2) feet might look odd but gives it a unique difference than the MK-II like it could spring into action!
3) Seems to have a lighter weight look in comparison to the MK-II
4) Less arms than MK-II due to power requirements or the combat capabilities of the mech model i am guessing
5) wings look more solid than Mk-II, perhaps it will be more better maneuvering in the air
6) Mech head looks less bulky and has a protruding horn/antenna giving it a more agile look maybe it has improved radar/vision/stealth ability to scout etc
Mk-II
1) Would be cool if it has a hard driver mode too would fit this well
2) Feet looks ideal for this, as it seems to be a heavier mech I would guess its a Medium to me it doesn't feel like a super heavy
3) The MK-II looks bulkier in general
4) MK-II has 4 arms could this be more to carry, 4x the POW and able to open something and retrieving the item with the other 2 hands perhaps hmm
5) Holographic style wings give it a dragonfly feel as it extends these seems to have more energy than the MK-I meaning it has more power but could have less maneuverability than MK-I
6) Mech head looks more bulky and aggressive looking and the shoulders too looks like especially the circular section on the shoulders is for launching rockets/lasers/ then again it could be just lights to make those shoulders standout!!!
To solve an issue with the feet why not have the option for changeable feet for the appearance then there is a given
choice for us to select what looks good to our individual taste.
Some like the open pilot look with the shield and others like the hard driver mode why not have both for any mech to switch
i like the hard driver mode more but its cool to see the other version too.
For those who do not like the 4 arms look could have it so it is hidden when not in use retracts and when its in use extends out of hiding think like where robocop has the guns in his outer thighs the same kind of idea but for arms and in the upper waist area of the mech.
Next the MK-III for super Heavy with a shiny shield & Mighty battle Axe-cannon?