FEL, (front end loader) ((requires to have min of 2 hooks on top, for chains)) if ya have a tractor, there is just way to many things a bucket does. vs dealing with wheel barrows, or little carts ya pull through yard.
finishing mower (don't care about type, belly, front mount, rear mount, zero turn mower, etc... just a good finishing mower, that ya don't have to push or walk behind.)
some way to smooth out and level the ground out nicely. either tiller, or plow, disc, and harrow, and/or boxblade, or rear blade, 3pt rake some sort of combination. that fluffs up the dirt nice. and gives a final good level to everything. without need of of a bunch of metal hand raking. and easily toss grass seed out. or plant a garden or like. it is a combination they all have there con's and pro's and what you are willing to live with.
bush hog, sickle mower (for dealing with tall weeds and small size 1" diameter trees/saplings)
FEL, BB (box blade) or RB (rear blade) either one but at min one of them. either for snow, grading, dealing with rock driveway.
hooks or something to hang off 5 gallon buckets, full of tools for a given project. even if it just a pair of pliers, hammer, and gloves for removing pins.
along with ability to store some sort of chain, or strap or something on tractor. there always seems to be a need to pull/drag, move something. were a chain comes in handy for.
BH (backhoes) are not primary, but boy, you can find a lot of uses for them. were the FEL just does not meet up to par.
PHD (post hole diggers), if ya have any sort of fence you need to deal with.
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there are just to many attachments that can do multi jobs. some are just better than others at certain things, and take less time vs others. or may require some actual physical labor.
it all greatly depends on your own needs, and projects / upkeep / maintenance you need or want to do. the more often you do something, the more likely you will get a specific attachment geared for that thing. to make things easier and quicker and do a better job. it all takes cash and time. so folks tend to get basics, of multi purpose use stuff. and then as time and cash allow get the more specific attachment things.