I am currently using XFCE because it is lightweight but I’d more interested in Gnome or Pantheon recently.
To my knowledge, these are bulkier are desktop environments. Will it have any effect on the gaming experience? I’ve seen a couple of mixed answers so I’m looking for more here.
Not really. Because the specs required for gaming is generally much higher than what’s required for DEs. As such, unless you are gaming on a low-spec machine, it really wont make a difference.