i use plex and mediabrowser.tv.
i use trakt to sync play states and scripts to keep plex metadata upto date with media browser as master.
Plex has the edge in terms of low bandwidth (cellular) efficiency, subtitle robustness on roku client.
but media browser is streets ahead for media management, metadata management, possible wider client and server support, more free/cheaper, better community,
I understand it can be a back end to KODI.
mediabrowser seems to have more momentum and community engagement.
I use mediabrowser everywhere on LAN/WIFI (TV, HTPC, Roku, Android, IPAD, DLNA) and only use plex when on cellular...although this will change when media browser introduces device syncing shortly. (i suspect much cheaper than plex, i hope its free as this is the killer app that will draw plex users in their droves)
give mediabrowser a try...especially Kodi users.