White, white, white!!! DH redid the sealant along the worktop where the sink was in our old kitchen and it looked AWFUL. Just looks dingy and doesn't hide the join properly. White gives a nice crisp clean line (although of course it doesn't stay white .....)
I agree you should match laminate - if the choice isn't just between white and clear. I was thinking of my old kitchen (orange tiles and wood worktops ......) and clear sealant just looked awful on them. You can't really see any sealant on my current kitchen which has upstands so I guess in that situation clear would be best.