have used both if its a single dive I may use the cressi comp 5mm for 35-40 mins at 20+m but found it getting chilly at 30m probably due to compression. in atlantic ocean at about 13-15 C. If I am doing two dives I will nearly always plumb for the drysuit for ease of changing during surface interval or if am spending a while on the boat as I found the wetsuit colder from the wind than the dry suit.
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