I bought a standard style stopwatch and holder that attached to my kneeboard. However, I found that during the high workload phase of instrument approaches, I was struggling to distinguish quickly between the minutes. I then bought a large scale LCD digital stopwatch, and there is absolutely no confusion for me now.
I'm sure it will come down to personal preference, but I defintiely prefer digital! (It also doubles as a backup watch for telling the time should anything happen to my wristwatch!)
DW