There's little meaningful difference between .45acp vs .44spl per se. Its a discussion of revolver vs semi, or between specific pistols you already own.

For a tiebreaker, SD suitable ammo is commenly available virtually everywhere ammo is sold. Suitable .44 is out there, but will require searching, and probably ordering.

Since you have a M629, your options would include midrange .44Mag. The Short Barell Gold Dot .44Mag would be a suitable choice, and is from a large mainstream oem. Most other hot .44spl/ mild aka Tactical .44Mag are from smaller mfg. I'd have no qualms with CorBon , Buffalo Bore or Grizzly. But other than lmited slections of CorBon not goin to see them on local shelves.