i use the Riseman, GW-9200-1ER. don’t really wear a watch unless i’m out in the hills (etc) so this one is perfect. altimeter works very well so far & gives you something else to help with navigation (not massively useful for mtb, but great for mountaineering/hill walking). it works on barometric pressure so can tell you if crap weather is coming in.
solar powered/radio controlled. world time is useful.
auto-illuminator – love this function – light comes on with wrist movement. great for night riding!
top bit of kit. hoping it’ll last every bit as long as my previous g-shock, which served 15 years.