Both snails you mentioned are inferior to an H/P Shimmershell Snail in my opinion. Speed is just wasted stats on a pet which are inherently slow to begin with. So it's either health or power and I'll pick power over health, especially when snails have life leech and a shield. However, as always, it comes down to the user's personal preference.
thanks for advice. i was under the assumption that a S/S snail could ensure superior speed but as i said, i didn't really look into it. it makes perfect sense of course that speed is a all-or-nothing stat. it only makes sense when it allows to attak first almost always.
as for the P/H vs H/H, i guess i generally prefer pure stats because they offer the biggest total, and of course snails get a lot out of it being a HP pet. tough you probably are right with P/H, since life leech is a damage dependent heal.