I rather have more desktop web browser users coming to my forum, and websites like blogs since I think desktop web browser users probably spend more time on websites instead of a few seconds, and members on desktop browsers are more likely to post more quality topics, and replies instead of just posting a short reply like a emoticon : or lol as a reply because of the smaller keyboards, and screens on mobile devices like smartphones and tablets.
Desktop users obviously for all the reasons mentioned above. Although some of my forums' members post mostly from mobile. I guess they're more used to using smartphones than I am. I dunno. I find it rather inconvenient to post from mobile.