How savvy are with the mechanics/electricals/components of a industrial machine?
Answering that question will help you answer the suitability of these roasters.
USRC has the real benefit of being US based support and have a decent reputation of supporting after the sale for parts and service.
The Toper is a solid roaster, and well built but you will be on your own more or less for support and service.
While they are the "same" as far as heat, fan, motor, controls etc, in that they all have the same things, you will need to understand the basics of switching, relays, fans, drive belts and motors, igniters and valves and regulators, with the toper you will need to source the items domestically based on what information you have available by reading the codes on the parts, or sizing and replacing with domestic parts that you are able to get.
I'm saying this as the owner of a Toper 10K of a vintage a bit older than the '05 you are mentioning. I bought my 10K 3rd owner and had to do a fair amount of work in regards to belt replacement, bearing sourcing and replacement, switch replacement, igniter and valve replacement (an upgrade really) a fan motor replacement and general cleaning.
The manual for the toper is nearly useless, but I understand the systems based on experience, and while it was a bit of a challenge I did all the work and have a great running roaster.
The speed of a response from Toper is nearly glacial, and I imagine if I were getting parts at that pace that it would have a huge impact on business.
Luckily between grainger and internet sources Ive never had that issue with my Toper.
No complaints on either roaster that Ive ever heard of but the support from usrc has the potential of being better simply being us based.