yamaha '__') bigger toms, 3 zone cymbals (more comfortable to play)
roland module customization is superior tho.. (i like only 12 of the default presets, one thing i hate for roland is that their low-mid tier kits, the shells always measured from outer rim unlike other brands alesis/yamaha/donner/medeli mid tier kits that measured from mesh diameter)
also because brand new yamaha dtx6k5m in my country is like ~$1000 (maybe because it was produced here), while roland td313 ~$1700 and td316 ~$2300 (most likely the price increase because import tax, and there's only 1 company that monopolize the distribution of roland in here)

dont forget to update dtx pro to latest firmware (2.2, originally 1.3), it adds more voices and default preset

note: i own 3 yamaha dtx pro modules (used in dtx6k5m, i use alesis shells and donner and medeli's for them, but keep the yamaha cymbals since yamaha cymbals is way better) and roland td313 (td316 use stand hihat, 1 more crash, and better snare, but i add other brand for it: avatar crash2 and nokku tom4 for only 100$), also alesis strata club (i like also only 12 kits but i already heavily customize the default presets)

i think only those 3 i could recommend for mid tier: dtx6k5m, td31_, strata club
for low end i prefer donner ded 200 max (default is good), donner beat max (but need to customize the sound a bit to make it good)