The DVD5s already have pretty heavy mpeg2 compression, so using handbrake to compress them further is a really bad idea - just use handbrake to make re-encodes directly from the MKV or AVCHD - you can set the resolution to the exact resolution of your tablet’s screen and you’ll get much much better quality results with the same or less effort.
As for Mega, the problem with that is that it limits the amount of data you can upload, plus I get much slower upload speed to it.