Certainly, desktop will be the most preferable for everyone, except those who haven't used the desktop version of the forum.

Basically, anything that has do with websites is always built on a desktop mode, so its best effort is presented on the desktop version for a better and convenient usage. So every mobile version is just an alternative version in case one is not in a private environment to use a bigger device.

Personally, i have been using the mobile version and I'm getting convenient with it as I'm not always free to visit the forum at home, so I usually visit and comment using my mobile devices.

If you also want to get a better user experience of the forum you can browse the forum using Tor browser it's also a privacy browser and a good one for the everyday user as it gives a better view of the website.