Suggested by Sonic Dante has super speed and high speed regeneration which are both really excellent abilities. He should be able to take a lot of the punishment that Accelerator can dish out but only for so long. Gradually his abilities will begin to weaken and that’s when Accelerator will really begin to have the upper hand here. His vectors is just such an absolute ability that Dante can’t hope to dodge it and Accelerator is fast in his own right so he could dodge Dante’s attacks long enough to win here. Accelerator wins.
DReager1.com
The Ultimate Fighting/Review Site
DReager1.com 
Dante’s durability is JUST PLAIN STUPID, my man slept through THE END OF THE UNIVERSE without noticing. {Shin Megami crossover fluff} This likely ends as a simple draw as neither can harm the other. (SMT3 and x Namco presume that Megiddo was successfully fired, ending “the world of man” and restarting the timeline. However multiversal beings that appear are presumed to be FROM THE ORIGINAL UNIVERSE and retain memories of that, Dante being one of them)
dreager does comp vs comp in each blog. So This would be comp dante vs comp accelerator, in any case, Dante destroys accelerator, it’s not even close.