samsung is the best end of story. they have the best screens, one ui makes android better, they have lots of cool features, and yes the older models hold up very well, I know people with s5 and still going strong. My only slight gripe with samsung is I'm yet to have a battery that impresses me or lasts me comfortably till bed time but I do always have screens on WQHD+
s phones I have had
S4
S7 edge
S8 plus
S10 plus
S20 FE (didn't like it so returned)
S20 5G (love it)