I have some thoughts on this, since the library arcade is coming up again soon.
Two things come to mind right away. One is the kit for Space Invaders/Deluxe. It's wonderful and I love it.

Eight different games, plenty of menu options, etc.
But unfortunately, there's no way to prevent the public from entering the operator menu, changing all the settings and leaving the menu on the screen for me to deal with when I happen to come in and check on it a few hours later.
Long story short: it's great for home use, but not so good for the library arcade. With that in mind, I'll be returning that game to stock before the arcade opens.
The other thing is the HSS multipac kit on my Ms. Pac. Love it! And the operator menu is "secret" so that the public can't easily get in and mess around.
But you know what? My memories of the golden age do not include the speed-up option for any Pac games. I do remember seeing speed-up in the wild, but not nearly as often as the original.
So in an effort to show / educate people what it was like for most people back then to play Pac & Ms. Pac, my preference is to disable the speed-up options. Harumph!!
(This'll also keep people from hogging the game so much, b/c they won't be able to extend their time by zipping around the maze & thinking they're really great at Ms. Pac.

)
The Braze kits are awesome. Multipede kit on my Millipede, Asteroids Deluxe multigame w/Asteroids & Lunar Lander.
There's a multigame kit for Gyruss. It's usually never available. I just checked the HSS website and I see it IS available.
Hmm, the settings menu can be disabled. Nice to have three game choices available in that cabinet. I love me some Time Pilot and Pooyan.
If the public can't get in and mess with the settings...
If the kit offers good choices...
If it's easy / nondestructive to install...
EDIT: The HSS multipac games are obviously more authentic than the Pac games in the 60-in-1 kit. For example, the sounds on the 60-in-1 Ms. Pac are just wrong. Others have noted the problems or flaws with the 60-in-1. In this case, I'd rather have fewer authentic choices than a lot of inauthentic ones. I like the HSS menu, too, which is just a simple list vs. a garish, ugly bunch of game screens. If you're presenting a retrocade to the public for a short time, I think it makes sense to keep the games as authentic as possible (balancing that with convenience and choice).