The only real difference, it that unlike OSMC where you can install most things with sudo apt install xxxxx, with LE you cannot as it is a read only system. If you have non Kodi installs then you will need to check if LE has something that will suit your needs.
Tvheadend server and client are available as addons.
If you're happy with the performance of Kodi on OSMC, then it will be just as good, if not better .
One thing you'll need to advise is the TV tuner used, as this can be an issue.
The best thing to do is install LE on a new SD card and give it a try and see if it meets your needs.