I think Emma would win this one. Emma must be a reasonably competent pilot, to survive so long in that obsolete Mark 2 against superior Titans MS. Chris, while we haven't seen her in combat many times, seems to freak out and make bad decisions. She would have died against Misha if she didn't have the armor plating. I think Emma could lure her into a trap pretty easily, by hiding in some wreckage or behind an asteroid etc.
If we're going by pure specs, the Alex has better acceleration but a weaker powerplant than the Mark 2 (MAHQ stats). Still, by stats, a Gelgoog Jager would wipe the floor with both
