SmartwatchesliketheAppleWatchSeries9andtheSamsungGalaxyWatch6Classicaresomeofthebestonthemarket.Yet,atalmost$400,they’renotforeverybody,especiallysinceyou’llneedtobetappedintoaparticularoperatingsystemtomakethemostofeitherwearable. Thankfully,foreverybodyelse,there’stheplatform-agnosticAmazfitGTR4,whichiscurrentlyonsaleatAmazon,BestBuy,andAmazfit’s...