I think the good old white plastic ones like Spalding are the best to go with.
The electronic ones seem futuristic, haven't used one but look like using the stylus only draws thin lines on the black background like other electronic boards I've used for other things. I know sometimes I use different colours for offence and defence, it looks like the ones I looked at on eBay for around $40 only have green writing.
Sometimes simplest is the best. Just don't get one of the crappy folder ones with court coloured court, if that makes sense. Get real filthy after a few uses. Bit like a girl I used to go out with.