Phillips sonicare. The entry level model works exactly the same as the most expensive model but just does basic clean function. Perfectly adequate for cleaning teeth. They are a bit like washing machines, come with lots of fancy stuff but you only ever use 40deg mixed washing cycle.
Oral B entry level is completely different to the iO which I find a bit gimmicky.
Another really good electric brush is Curoprox Hydrosonic Pro. Expensive but worth it. It has a small brush head, same technology as the Sonicare but is smaller and lighter. The brush heads are far superior and are soft. They have polyester filaments that don’t wear as quickly and finer .
I’ve noticed that the sonic brush action tends to clean deeper between the teeth leaving less plaque. You still need to floss but you don’t find as much rubbish.
Steer clear of the cheap and cheerful brands. You get what you pay for.
Boots or Superdrug frequently do 50% off dental healthcare so worth waiting until they are half price. Argos are cheap for replacement heads.
https://www.superdrug.com/toiletries/dental/electrical-toothbrush/philips-sonicare-sonic-electric-toothbrush-2100-series-white/p/812433?gclsrc=aw.ds&gad_source=1&gad_campaignid=20833622325&gbraid=0AAAAADp4mz8wra8iWHXFnN3Gkn2FIQ8zs&gclid=Cj0KCQjww4TGBhCKARIsAFLXndRzCcv98Hw9YPoNEJsJJhM5_Rw6CtTcyA3OOsoNOKCKwRlxv8NouO4aApenEALw_wcB
Superdrug are currently selling Sonicare for £29.99 rep is normally £70.
I alway recommend starting with entry level model because you need to see if it suits you. Finally DON’T take it out of the box and use it straight away. They usually have a Q code to see how best to use it. You can’t use it as you would a manual toothbrush.
I am a dentist with 35+ yrs experience. We are either given brushes to trial or can buy them heavily discounted. I have tried most models and the ones I’ve mentioned are the ones I like best. I gave a Curaprox Hydrosonic to my DS who like most teenagers tends to use a gadget till it needs recharging but he has been using it for 18mnths now and religiously recharges it. While he’s waiting for it to recharge he uses my brush, just swaps the head over.
We also love the Curaprox manual brushes. They have 5x the bristles so clean more effectively and again they are polyester so don’t absorb water and splay. You can also snap the head off the handle so the handle can be disposed of in the recycling bin.
My favourite is the Velvet but I have a drawer full off 5460. The number refers to the number of bristles. They are soft and it doesn’t feel like you’re brushing your teeth but they are really effective.
https://curaprox.co.uk/toothbrushes/manual-toothbrushes/toothbrush-cs-12460-velvet-p500