simply : SV in a vac bag in water vs SV in a controlled , accurate steam environment w/o bag :
Water has more thermal energy than 100 % humidity. steam ovens are about humidity , not steam
unless you go above 212 F // 100 C also , steam SV requires you protect the food from condensation .
I looked at steam oven years ago : very expensive , and not very large.
holds for the Anova , and the Anova does not steam clean. a major feature of steam ovens.
SV in water w a circulator . Id say.