There are ups and downs using both systems. We plan to use a mix of the two as stated above. For example, we will not have unlocks be based on rank, but you will be able to buy more equipment by killing and earning more money within that round. This drives the game to be a skilled base game rather than a stats padding-unlocks game. However, we do plan to have a global stats system where people may be able to go online and look up their stats such as Kills, Deaths, Favorite weapons, Wins/Loss, Maps ect... as most do like to view in numbers how they are doing on a global ladder.
The second option of having a CO give you a mech (or more specifically - give you enough money for a Mech) will be centered around the 31CW Game style of play. Planetary League that will have the hundreds of stars where players may roam from planet to planet to battle out in a more traditional league style of play.
These two systems will give players the best of both worlds and still be able to keep them separated from each other for players who don't like the other game types. This mod is more so about bringing the community together as well letting players play how they want when they want.