As with anything, it depends on what you’ll be building, I guess. I’m very happy with a horizontal slot mortiser (Felder) and a domino XL. I’ve also used a template and router with an upcut spiral bit. But I (almost) never need a square ended mortise and work predominantly with slip tenons (1/2” and 3/4”) as opposed to integral tenons. I’ve found the only practical reason to have square ended mortises is for aesthetics in exposed joinery (for myself at least). But that doesn’t answer the question posed. Wish I could make a recommendation.
Don't ask me how I know that!