I have both.

Bought Oral-B for my wife 2-3 years ago. i remember quite pricey. She don't bother using it also. It's round shape. I find it's quite small and a bit hard to brush certain area. The grip is good though.

Got myself Xiaomi Soocas X3 from shopee at RM 149 and lovin' it so far after 3-4 months of usage havent change the head. Cool looking. The charging port is very simple looking and small compare to Oral B where u can put few heads there. Head is okay - normal shape & size with softer brush. Twist abit for deep cleaning. If i do that with Oral-B my gum will bleed. Apart from that, the grip is quite slippery when ur hand is dry. i love to use strongest vibration, toothpaste will spill all over the mirror (have to brush with mouth close). Button not as sensitive, need to press harder.

Well RM 149 for that quality i would say totally worth it and you're most welcome. 
Its much cleaner to use electric brush rather than brushing myself.

Mine is Xiaomi Soocas 3 i believe. Was planning to get black but no stock. Price at RM 149 from Shopee.
Feedback as above. Other than that, i can tell the brushing time 2mins (sorry cannot remember well) cause that's recommended brushing duration but i usually 3-4 mins. Charge every month or so. 4 different speed/strength watever u call that. That's all i guess.

Xiaomi Mijia Toothbrush Soocas X3 Upgraded Electric Sonic from wesupermarket in shopee < to be exact.