I like the four post ROPS open stations on my Tennessee farm. Top gives good sun shade and overhead protection. Posts help with side limbs. Windows in the woods is hard to keep intake.
Had a cab Kubota M5030 that the previous owner’s sons had busted out every window out except for the doors which were removed. The air conditioning didn’t work but the heat did. Gave great protection in the woods while I owned it for >20 years.
For woods work definitely need overhead protection.
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Typical problems involve making space for the compressor, condenser and lines to the interior evaporator. A bonus would be a cab that already had the evaporator and controls. But there are evaporator units that can fit behind the seat.