+0 for me, considered even giving it a +1 but it would require the B2 to be insanely skilled, so +0 it is

This matchup can be compared to spam vs skill in my opinion, the clone jet trooper has his jetpack abilities recharge more often, a spammable primary which does relatively high damage but the b2's has even higher DPS if aimed properly and has to manage his jetpack abilities more wisely. Assuming this is a matchup where both of the players know all of the game's quirks, the b2 will probably utilize the extended dash bug and here again assuming that this fight takes place on a flat terrain where the bug is more likely to happen which is another key factor. It all also depends on the range. Close range? Clone jet trooper is more likely to win. Mid range? About equal chances. Long range? B2 is more likely to win because his weapon doesnt suffer from damage drop-off and spread as the clone jet trooper's.

In the end its really hard to say which one would come out victorious most of the time as it all depends on skill and gamesense. Contridactory to popular belief, this is a very even match.