Fenix 5 or Fenix 5 X ?

Go for X if you want to avoid any connectivity issues, but overall I gave up on both at the end :)

Yes, you can import and export GPX files through Garmin Connect.

Personally, I don't see a lot of value in mapping on a wrist-sized screen (at least, not for what I want to use maps for). Others find this to be a significant plus.

The F5X is heavier and has less battery life than the F5. If you see value in maps, get the F5X, otherwise the F5 would seem to be the better watch.

If perceived issues around connectivty concern you, the Forerunner 935 (same feature set and design as the F5, but in a plastic case) is a better solution than the F5X.

For map, I use whip out my phone and use Google map. It can do bicycle trail, etc. Its bigger nicer sharper screen. Thats why I only have the F5.

I've used the F5 sapphire for some basic map trails (running) and it's been okay. For cycling I would only ever use a head unit. As for connection issues with the F5 - I've not had any issues at all really. A lot of people have (and of course they will post on this forum), but many others haven't. From my point of view, the F5 is a fantastic piece of kit.

Then you are lucky, as I have had 3 F5 watches, all of them had connectivity issues with ant+ devices, dropouts. Two colleagues from work experiencing the same, as well had their exchanged and same, so totally 6 watches with same issue is it is quite common issue. Altimeter/GPS performance as well are weak points for this watch, cheaper 935 brother does these tasks better, cause better function designed, Fenix is having design flaw which impacts connectivity and GPS.

For me the same as chatlow, no problem with connection issues or dropouts. i'm very satisfied with my Fenix 5 (not the Saphire version and also no scratches) and i wear it every day for sport and office since may 2017

Definitely 5X. It is a little bit heavier, and has shorter battery life, but is not affected with Ant+ problems, and the maps can be useful for running or biking following a route - dont expect you will use it as a real map, but the experience is much better than following a black line on F5. And actually F5X costs almost the same F5 Sapphire, but in my opinion is less affected by scratches on the bezel.

Just to add my two cents' worth: there seem to be users with connectivity issues with the F5. I cannot confirm this, as I have an F5 and the only thing I find to gripe about is GPS accuracy (but within moderation - it works well enough for guiding on pre planned tracks - the only issue really is accurate tracking of pace and distance, for which I now use a footpod). Both BT and Ant+ work fine for me. Leaving these questions aside, I have no direct experience of the F5X. But I bought my F5 after having thought long and hard about whether I really need maps and WiFi on my watch - at a considerable extra expense for an item which already comes at a premium. I decided no, and I don't regret it. If I want to plot a track for running, I do it on GC and upload to device which guides me - the lack of a map has never been an issue for this. The F5 can also guide you back to start etc. For Wifi I really don't see the point if the watch syncs with the 'phone - why on earth would I want it to sync independently via WiFi and pay hand over fist for the privilege? So for me, that was the decision tree, and I do not regret my choice.