I have both PantoRouter and Leigh D4R Pro. I bought Leigh D4R more than 10 years ago.
If you want to choose only one between PantoRouter and Leigh D4R Pro, yes, PantoRouter is the choice, cause it can do more than just through dovetail. IMO, I think every woodworker should have a horizontal router.
Leigh D4R Pro can do more than through dovetails, like half-blind dovetails, single pass half-blind dovetails, rabbeted dovetails...