I'm a little different... I don't recommend 3rd functions *IF* you don't have rear remotes already. I built a road to my creek and having hydraulic top link and side links were very important. So I added an extra 3 spool valve so I can save money (adding another spool was $50 or $75 extra). I was doing the work for the rear remotes, adding another was the difference between 2 spool vs. 3 spool.
Of course if you already have them OR you don't need the rear remotes and just want the grapple... forget what I wrote
The main difference between 3rd function and the 3 spool, is I have to reach for a handle instead of pushing a button. For the savings, to me, it was NOT a problem and I have had it for many years and it's still not a problem.