A Good Future Proof Android phone

Meanwhile as I’m already looking to get my mum a fitness gift i thought it get my dad to upgrade from his old HTC phone and gift him something thats both future proof and a really good piece of tech on a somewhat close to 700 bucks budget. What company should i opt for something like Samsung or Oneplus that i see a lot of buzz about.

Most Android phones seem to last around 3-4 years. I’d say Oneplus might be a better bet as they are better at keeping their older devices up to date vs Samsung who generally drop support fairly quickly.