Things always depend on how much money you have to spend and what you want for an end result.
Assuming you want large cell foundation in deep boxes for brood, nucs are hard to beat. Especially from a reputable source who will sell you a good strong nuc.
Assuming you want something other than large cell foundation or something other than deeps, then finding medium nucs or small cell nucs (or small cell medium nucs) is another undertaking. You might find them, but they are hard to find, so packages become a more likely method. Again, both the packages and nucs cost money.
Making splits won't cost money (unless you are short on equipment or you buy queens) but will cost you honey. On the other hand some years you almost have to make some splits to keep them from swarming.
I like walk away splits, but only if the part rearing the queen, at least, is rich in stores and bees. Otherwise the queens get underfed and are not up to the quality I want.
I did a lot of walk a way splits this year from eight frame medium boxes split by the box. I just "dealt" them like cards. One for you and one for you. It worked really well in mid may, not bad in mid June and not as well in mid July because of the way the flow went.
There are several reasons to raise your own queens, among them are acclimatized queens.