Yeast activity

[JapanBrew]

Maybe a noob question but did my second brew with s-05 and the yeast activity was different. My first with this yeast had an OG of 1.035. It dropped to 1.010 so it was fermenting but almost no krausen.
Just finished another batch and the OG hit 1.048 and now on day 2, krausen is growing. I wouldn't say explosive by any means but a good mound.
So the question is lower OG less krausen? Or is it the type of beer? Last week was a Pilsner this week was a stout.
Could it be oxygen? I know on the Pilsner I was having issues with getting air into the batch before I pitched.

 

[HisDudeness]

Not unusual to see quite a bit of variation like this from brew to brew, a lower OG and less oxygenated wort would certainly tend to give less vigorous fermentation and reduced krausening. I don't tend to get particularly massive krausening with this yeast either so I wouldn't worry about it