All Lemmings ports are at least decent. Amiga version is probably the best one, but DOS is very close. I even prefer OPL2 FM music than Amiga modules in this, so I would pick DOS game.
DOS port is lacking 2 player mode and it's also has an issue with music. Each level should have it's own music, but in DOS port music works in that way, that there's a list of songs and when you finish a level, you get the next one. It would be OK, but when you lose or restart level, you will hear the first song. It's very hard to play that way, since on later levels you will mostly listen to one song all the time.
I would definitely put Lemmings in my TOP3 games of all times. This game is just perfect. Great level design, flawless lemming skills, and pixel perfect accuracy of the mechanics. There is just one problem: controls. Game lacks an active pause feature. You can't even change current ability when paused. In DOS port at least you can use F1 to F12 to quickly select skill, and they even work in pause. So at most intense moments you press F11 scroll, setup mouse, set skill, press F11 and click. On Amiga or Atari ST ports it isn't possible to do something like that.
But nowadays we have a modern ports made by community. The best by far is Neolemmix: http://www.neolemmix.com/ It retains classic look and feel, but improves everything:
1. There's an active pause in game. You can change skills, or use them on lemmings while in pause. You can even skip time frame by frame.
2. There's fast forward in two variants:
- simple fast forward that speed up the game - good for times when lemmings have to walk a long way.
- press button to skip 10 seconds or rather time for building one bridge. When you start building, press button, and your builder lemming is laying his last two blocks.
3. Other improvements:
- bomber explodes instantly, no 5 seconds wait.
- instant replay - when you played for a several minutes and made a mistake. Press ESC and start again. Game will replay your moves from the last time until you make some new action. Good for those long levels. When you missed something on the last obstacle you don't need to do whole level again. Restart, use fast forward and play correctly.
- directional select - use arrow keys on keyboard to choose left/right facing lemmings only.
With this improvement game is way more playable and you can really enjoy harder levels.
The game learning curve is amazing and game engine is precise. Later levels were designed acknowledging that. There are several ways to slow down or turn around lemmings without blockers. Later levels require that. Unfortunately it's really hard to discover these mechanics on your own. Back in the day there was a hint book. Now you can watch all the levels solved on youtube.
Last year I actually finished all the levels for the first time. Reading ending screen you will clearly see that developers were aware that very few people will finish Lemmings 1.
Lemmings community is still alive. New level packs are made every few months. There are thousands of user levels from all those years since game was released.
I would myself do some levels, but unfortunately I can't get neolemmix editor to work on any of my computers. Anyway it's a longtime goal on my lifetime TO DO list, so sooner or later I will find a way to make my own lemmings levels:)