I can see how the top link would be faster, but never used one, and am wondering how much it would be worth. I'm guessing the cost of the top link would be over $1000.
For the top link, it is relatively easy and cheap to buy an aftermarket one, and relatively easy to swap it out. Just pull some pins, take off the old one, put on the new one. In fact, you may find that aftermarket ones, such as those sold by W.R. Long here on TBN, are a better buy than what your dealer offers. So if I was in your shoes, I would feel comfortable holding off on the hydraulic top link if I wasn't sure. But the consensus on TBN, by far, is that you should settle on the number of remotes you're going to want when you buy the tractor, because adding them afterwards is much more expensive. As far as I can tell, this is because adding the remotes involves a lot of dealer-specific parts and labor, at least if you want your remotes to look like an integrated part of your tractor, versus a big bank of valves sitting on your fender or something (not that there's anything wrong with that). The dealer is usually willing to cut you a deal on labor installing the remotes, if it helps move the tractor, but once the tractor is out the door, it's full labor cost and thank you very much for your purchase, sir!
How many remotes you need depends on what you do. I have seen people on TBN say they absolutely could not live without as many as four remotes. For example, with a box blade with hydraulic rippers and hydraulic top/side link, you're at three spools. With a grader blade with hydraulic top/side link and hydraulic tilt/swing, that's four spools. Some people like to control a grapple on their FEL by running a hydraulic line from a rear remote up to the front of the tractor; if you do that, that's an additional spool that will be tied up whenever the grapple is on the tractor. As others have pointed out, if you're going to run a batwing, two is the minimum, but three would allow you to raise/lower the wings separately for finer control. On the other hand, if you never did box/grader blading and only ever wanted to run a wood splitter off your 3ph, a single remote would probably satisfy. The bottom line is that the "right" number of rear remotes depends entirely on what you intend to do with the tractor. More remotes opens up more options for convenience, comfort, and efficiency of work. And you will always be able to think of one more thing you could use a remote for, so if you buy two, within a few years, you may wish you had three.
Getting back to the hydraulic top link, I think whether you are going to want it will depend a lot on how much work you do with ground-engaging implements like grader blade, box blade, and so forth. Being able to change the aggressiveness of the cutting edge on the fly via a hydraulic top link is a huge boon. It really speeds up work. For me, I wouldn't benefit as much from being able to change the tilt on the fly, but I have heard others say that they'd take a hydraulic side over a hydraulic top any day. A hydraulic top link is also nice if you ever have three-point pallet forks or hay spear, because it allows you to angle them and keep them level as the hitch goes up and down--but with the loader on your tractor, that's probably not a use case you're worried about. On the other hand, if most of my work was mowing, well, I never adjust the top link on the mower once I have it set level, so hydraulic top wouldn't really help me there.
