I think you would be happy with either one of those tractors. I know I would. I have a New Holland TC40 and love it. It has been good to me and I own it. However if I buy one again I am leaning heavy towards a 5 series type tractor. I am only on 16 acres but could definitely use the extra grunt/weight/HP of the bigger 5 series.
I just recently acquired a excavator from a family member. It was BIG to me. I cleared 3 acres with a 14,000 lb. mini-ex for my house site. I thought that was big but it took me 35 to 40 minutes on big stumps to get them out the ground and some I could not lift out of the hole. This new excavator I have is 24,000 lbs. Takes about 5 minutes now on similar stumps. My point is I thought the excavator was HUGE and more than needed but now that I am operating it, I would not want anything smaller for the application I am using it for.
You can always add a smaller tractor down the road but I would be leaning towards the bigger tractor to start with the clearing/reclaiming fields. Oh, and get a grapple right off the bat! You will not be disappointed.
Indeed, leaning towards the 5. Excavator may be in the cards eventually too.
Another question: how likely am I to get a 5075E stuck in the woods? I have a bunch of hills and some areas that are pretty wet most of the year (water runs off the hills and soaks the flatter areas).
How much mud can these things handle, and can you do anything to improve ability to handle it (different wheels/tires)?
And would a 4 series be better or worse in mud?