According to spdat.eff, The effect of JBoots is a flat-rate 35% increase in speed. SoW uses the formula of 30+level/2, up to a maximum of 55% at level 50. so a level 9 shaman's sow is slower than jboots, a 10-11 shaman does the same, and any other sow is superior to jboots. SoW also lasts 36 minutes, compared to the 18 minutes that the JBoots effect lasts.
Jboots are slower than SoW, not much slower though. Jboots are a 70% SoW, still fast enough to get away from most mobs, but not all as some are faster the SoW itself
Reading the full description above, I see this: (a lesser version of Spirit of the Wolf). I take this to mean that it is slower than SoW. Though I can't say for sure since I've never seen them or know anyone who has them.