Definitely unlaminated. It's a pain in the @rse trying to fold laminated charts, and even when 'folded' they're still bulky & may not stay folded. Not to mention finding your 'special' map pen before writing on the chart, carrying metho & a rag or similar to erase...
Stuff that. I'll stick with paper & pencil. At least when (not if) I drop my pencil(s) I can write on it with just about anything.
I like US charts because most information needed for a flight is printed on them: freqencies, runway lengths etc etc
I prefer the colours, shading, tinting & symbology used on 1:1 000 000 WAC series. Don't like the colour coding used on 1:1 000 000 ONCs. Not as great a degree of height discrimination AND one colour indicates generally level terrain, not elevation.
I like the chart size of ONCs though. Minimises the number of map changes & edges.