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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
The DDA unit is quite good because it plugs straight into the bike and includes the software to chart your laps. It includes a load of info from the bike including revs and speed, which a normal lap-timer won't have access to. I picked a DDA up for under £50 off ebay a few months ago, so it can be a really cheap option!
Ideally you want to write down a list of things you want your system to do, and then compare all the different systems to see which one is best for what you need/want/would like it to do.