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Until moving to Australia I had never used a snorkel whilst diving, however where I dive has long surface swims. I've resisted until my last dive, surface swim killed me on my back. I'm as I type simultaneously looking for a snorkel, good but not one that will break the bank. I used to own an AA Sv1 snorkel, used it a couple of times snorkeling but then sold it, it was nothing special and IMO not worth the price.
What kind? I have an IST SN60 and it works great in my dive bag on the boat.
It has a wide bore oval tube, no "dry" choke valve up top but a purge valve in the bottom, and a flex section for best fit. All parts are obtainable separately incl. the mask clip: you can get one for your every mask.