A MEMU has ample of advantages.
1) Bigger coaches with more space and passenger capacity
2) Stairs at doors (Useful for halt stations and emergency evacuation)
3) Better seats (Bigger and sometimes cushioned)
4) Vestibules...
more...
5) One toilet per coach
And everything comes at a similar speed/ acceleration. In my opinion MEMU is way better than EMU. Still not sure why IR operates EMU trains in suburban sections.