Spoke with my Burris Rep:
"The Burris BTH50 is a direct competitor to this model from Pulsar, and outperforms it in sensor resolution and magnification for a lower price, but I imagine if this guy’s looking for an upgrade, he’s probably thinking about bumping up to the next level- at which point I’d suggest the Steiner Nighthunter H35, but it’s 640x480 sensor resolution commands a significantly higher price.
For his weapon mounted thermal, the BTS50 is similar in performance to the BTH50, but lacks the recording capability. As a potential solution, the BTC35 and BTC50 are a hybrid design that can be attached/removed from a weapon system and used as either a handheld scanner or to imbue a day scope with thermal imaging capabilities"
As well as my Pulsar Rep:
"I’d recommend a Helion 2 XP50 or Helion 2 XP50 Pro based on his budget. Almost double the resolution and a lower base magnification for wider field of view and much better clarity. Or thermal binos like the Accolade Pro’s which will be better on eye fatigue at night."