Wetwall vs B&Q plastic tile-effect stuff

I am putting in a shower and a bath in two different rooms, and quite fancy using wetwall-type plastic panels rather than tiles. The panels seem to be about 120 a sheet, but B&Q do small ones 800-odd mm wide x about 2m high for 40 a shot. The difference seems to be that the B&Q ones are much thinner, but I can't imagine this matters a toss.
Any warnings or recommendations about either type of product?
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