I have had both and see the pros and cons like this.
Pros:
warm in winter
cool in summer
dry when wet out side
quiet and no hearing protection needed
no alergies
no dust for your lungs
no sun burn so less chance of skin cancer
no chemicals when spraying the fields
comfortable and stay clean
controls inside cab stay dry (seat electronics etc.)
longer days in the field due to comfort
added weight of cab for traction
cd player/radio
Cons:
Cost (not cheap)
more trubble to get on and off
less head clearance
no open air feeling on those perfect days