i have been a landscaper for over 20 years, before we bought machines we used to only rent fel and they did jobs fine. Finally we rented a skid steer and never went back, they are just so much more versatile and fast. I currently own a small wheeled skid steer that i have steel over tire tracks when i need(not too often) and a smallish excavator. The skidsteer could do everything if i wanted but the excavator makes everything much faster. Skidsteers can do basically anything since you can buy or rent an attachment to do things you haven't even dreamed of. I have tipped a fel and a skidsteer and could have been killed on the fel but just got a little smacked up on the skidsteer since you are sitting in a full cage. Wheels can tear up finished turf more than tracks depending on treadwear and how you drive, but they can also last a lot longer than tracks with much less maintenance. With my steel tracks on i can go anywhere, even very deep mud that a tracked will spin in. BTW, I am always a proponent of used over new as long as you do a good inspection and know what you are getting into. Don't shy away from smaller machines as well, they are much more transportable, get into tight spots and cost a lot less, plus they weigh so much less that they can be used on finish turf pretty easily and they are still overpowered since attachments are hydraulic instead of shaft drive.
Also, I did a bunch of clearing and grading on my 5 acres when we first moved in and i bought a bulldozer, It worked extremely well but in hindsight i would have rented and done it in one shot and then whittled away at the smaller jobs with my other owned equipment(although i did sell for more than purchase price plus all repairs, so it was basically free). Dozers are awesome but you are literally breaking them every time you use them, too much upkeep.