Quad with tracks will cost a fortune to buy and be very heavy on maintenance. I would try a smallish quad first, maybe a 350, and see how you get on with that for a season. Being lighter in weight really does make a difference.
I'd go this way for reliability. Tracks needed maybe 3 weeks of the year where I stalk for snow otherwise wheels are good. If you needed a canopy to keep clients dry/warm I'd go for a Polaris, very few places they can't go an Argo canHave you considered a quad with tracks on it mate?
With Argos a lot depends on the ground that you are working on. My father and I ran a second hand Magnum from 1990 to 2021 on very wet ground with very few rocks. It's probably still running somewhere in Perthshire. It didn't get abused and bits were fixed as soon as they became and issue. It cost £4k in 1990 which was a lot then for an Argo and I sold it in 2020 for about £2500. What was especially handy latterly was being able to call the man in a van to come and fix the Argo. I took a photo of the broken tensioner and the man came and fixed it the next time he was passing.If an Argo could be got for quad money, survive on a service every year and not likely to break down I'd have followed that option up, but that doesn't seem to be the deal...

Many happy returns for tomorrow!Argos doing Argo’s now?, SORRY, couldn’t resist my inner t#at
It’s a buildup thing ….Big seven Oh tomorrow.
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