Like you the 24-26mm is my preferred knot with a 50-52mm loft.Personally I find 30 mm nice to look at and fun to use occasionally but 24-26 mm is my preferred range.
I've never tried a 30mm, but it seems to be becoming the norm now in the Maseto range.
I have a couple of large knot boar brushes and being a face latherer they're my least favourite .