Really bad matchup.
Basically, if you are doing cooperation (Digiteam vs EXEteam), some of the 'destined will NOT get along very well, on the other hand they are fighting against warriors with major teamwork skills. And considering how each fighter "matured" upon one series, it's not gonna end well for both sides (since the EXE side can fight just as well by themselves, with only half the power).
Fireman vs Agumon & Tai on the other hand, they can pretty much defeat Mr. First Boss with Agumon's "WarGreymon" Mega form, and the fusion of Omnimon by Wargreymon and MetalGarurumon. So basically, the number ONE rule when doing a "VS" is.. Never pair a main character against a main character EVER, unless you thought well enough about one's own strengths and weaknesses.
That said, how in the steaming hell would the EXE team fight an army of 'Destined (if I remember, there were a [parasitic bomb]-ton of them after the "Our War Game" incident)?!