As far as SRs go I believe Thanatos is also pretty valuable, mainly due to how rare she is.
As for the question asked, it's as the above post explains; skill potions are only really worth 3 or so Stamina potions, mainly because Nexon doesn't seem to have a problem with people making multiple accounts in order to accrue skill potions (it's not difficult, but it takes time).
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Thx 4 the info Abyss and Micheal, and one more question.. stamina pots vs battle pots which is valued more for a trade? I guess depends on the events/raid bosses?
Though they cost the same you typically get much more out of stamina drinks than battle drinks. Under normal circumstances, a battle drink will allow you to battle another player once for maybe a few thousand gold (if they happen to have enough) and up to 40 something experience (if you battle someone higher level than you). On the other hand, at higher levels a stamina potion can give you 300+ stamina which is equivalent to 600+ experience if you spend it all in Chapter 2, where the exp you gain is 2x the amount of stamina you spend. Of course, the actual amount you gain is actually higher if you include the experience and gold you get from the Netherworld, which you'll inevitably enter multiple times by proceeding over 100 times.