Jo Jo, it's not that the Square Deal is a bad press, it's that it uses proprietary dies and will not do rifle. So, while having one as a dedicated 9MM press is not a bad thing, the caliber changes for other pistol caliber would be significantly higher as you'd have to buy the dedicated dies for each. I think JMorris and others have one, or more, set up for a particular caliber.
Back to the LNL, as I mentioned, I can't speak to the Dillon. The press comes with 5 LNL bushings, you'd have to buy the shellplate for 9MM. The press includes the powder die with the powder measure case activated system. I don't use the PTX from Hornady. Some here do and they can provide some feedback on it. For 9MM and most pistol calibers I set up as follows:
Station 1 - Size/Decap
Station 2 - Flare/expand
Station 3 - Powder Measure
Station 4 - Hornady bullet feed die (9, 40, 38, 380, 357, 45 ACP) with tubes
Station 5 -Seat/Crimp
There have been some threads on the bullet feed dies and the competitors. Some day I may try the Double Alpha or Mr. Bullet Feed dies. As to the bushings, you can find them for 3-4$ each in either 5 or 10 packs.
Changing caliber would require the shellplate and some bushings, but nothing else would be a MUST. There are some things that make caliber changes easier/quicker. Additional Powder dies that way you don't spend the few minutes setting the powder drop. They run around $20-25.
CFullgrag came up with a novel way of handling this. He developed his own powder drop tubes to keep from having to change/adjust the powder die. I borrowed his idea, with his gracious permission and drawings, and made my own set. It works well for the common pistol calibers and makes it quick.
I've also had very good Customer Service from Hornady. So I can vouch for that.
Keep the questions coming!