Best smartwatch guide: The top smartwatches to buy in 2018

Smartwatches are very much a mainstream tech category now, and with 35 million expected to be bought in 2018, there are many contenders for the crown of best smartwatch. Everyone from Apple, Fitbit, Samsung, Fossil, Tag Heuer, Garmin, Huawei and LG are creating a boom in popularity...and it's tougher than ever to choose. So, whether…