I recommend Oral B Pro 2000. Using it now.

Pro_s (no pun intended)
1) li ion battery lasts long
2) speed and vibration are strong. Those cheaper models like 500 have lower speed and no vibration.
3) reasonable cost of replacement heads - look for Lzd/shopee official store punya offer

Cons:
1) battery indicator is useless - you will feel it slow down and then the low battery indicator will come on.