I have had both an X485 (precursor to the 728) and an X595 (precursor to the 748). I have also had about every other compact JD makes, other than the 2210. Some of my fellow posters will accurately say I have even had two of some---and they would be correct. I will tell you my feelings and they are by no means the law, but are based on a lot of personal experience in different working situations. The X series tractors are the nicest garden tractor on the market--period. I have always thought of them as being subcompacts. Do not be fooled by their streamlined appearance and cupholders, for they are real working machines. They are nicer and more comfortable than the 2210 was and I think the 2305 currently is. By nicer, the frame, creature comforts, etc. They will pull just as much, if not more, due to their more advanced frame design. They have tons of power and mow great. My 595 would finish most mowing jobs just a few minutes slower than my dad's current 757 ZTR JD, and cut great. I loved my 595 and would still have it, save for one thing: the hydraulics. These machines, good as they are, have very simplistic hydraulics that are below the level of the tractor. The loader was pretty weak, yet still useful, and it was a nightmare to adjust the hydro relief valve for operating front and rear hydraulic attachments, which these machines cannot do at the same time. The three point and rear PTO can be easily added and despite some claims, these machines are hot resellers many places, and hold value well. So, to delineate further, get the X series for mowing and some light ground engaging work, but avoid them if hydraulic capacity and flexibility are in your needs. They are expensive but are so nice and longlasting, they to me are well worth the money. Some also say the diesel is not worth the extra money, but I found it the single best thing about the tractor (besides the four wheel drive).
John M
