New is not necessarily better. Commercial coin op pinball machines are built for reliable and low maintenance operation regardless of when they were made.
Dark Knight?? Drop a bunch of quarters and learn the game and whether or not it is just Batman hype or a well designed and fun for years pin game.
New doesn't have much to do with how reliable or how much fun a game will be over time. True "keepers" are far and few between.
My bride and I have bought, enjoyed, sold or traded about 150 pin games since we bought our first one in 1975.
Once a pin game is in good working order and has been set up in home use it can go for years and years without a failure or problem. Following is our personal experience with the different types of games.
Electro-Mechanical (no CPU - only wired logic) We've owned more of these than any other type and still have one - Old Chicago - we started playing it in a tavern early in our marriage in 1976 - bought one for home use over 20 years ago and over that time I have had to do very little except replacement of light bulbs and worn rubber rings and after thousands of games it has been extremely reliable.
Solid State - Began appearing in the late 70s and are extremely reliable and made for hard use - Bally or Williams or Gottlieb. We still have 5 Ballys - Eight Ball, Eight Ball Deluxe, Fathom, Centaur and Star Trek - all continue to work and are fun to play and we have owned them for 15 to 20 years - One Williams - F-14 Tomcat - had it for about 14 years and it is a killer game - we have beaten this game to death and only maintenance so far has been to replace worn rubber rings and light bulbs.
Digital Games - We now own three - Twilight Zone, No Good Gofers and Fish Tales. All three made in the 1990s and all three work perfectly and I expect them to last for years.
OKAY - here is the thing about pinball games. They are complicated machines that are CPU driven with multiple circuit boards and complicated wiring and a lot of transistors, micro switches, coils, digital displays and other stuff that can fail.
Buying a new one from a dealer that will provide in home warranty work might give you piece of mind.
You should know that the new ones don't play much differently or better or more reliably than games from the 1990s and some from the 1980s.
HOWEVER, game components will fail and it's very helpful if you can do a bit of electronic tinkering and know how to use a multi-meter, read a schematic and use a soldering iron. Example - other day a coil shorted in our EBDeluxe which cause a transistor to "fry" on the Solenoid Driver Circuit Board. No big deal - I replaced the shorted coil and the associated transistor and all is okay again - BUT - if I had to pay some "tech" to do that repair it would have probably cost two or three hundred dollars - or more.
What should you buy? Do your homework. Go and play the game - don't worry so much about new but how much fun the game is to play and what kind of condition it's in. Learn how to inspect a game and to use game test functions to run diagnostic tests for coils, switches, switch edges and lamps.
Play, play, play it and make sure it is fun and a challenge before you buy it. New isn't important - I'd rather have our 1993 Bally Twilight Zone that most any of the new pin games I have seen. Remember that you can buy two or even three KILLER pin games for the price or a new one.
I rattled on a bit - hope it is helpful.