Holiest? How many children do the families have? How many of their young girls wear short shorts and tight jeans and such when they are not at mass? By their deeds you shall know them.
From my long experience with trad diocene people I have concluded that they gage themselves against the Novus Ordo, and so of course they are "holy".
Anyone that constantly compares themselves with perfection, will never call themselves holy.
Your sedevacantist chapels are no different, my brother. In fact, they might be worse. I've heard stories.
Stories is one thing, actual experience is another. What I said is from actual experience, and you are assuming I go to a sede chapel which I do not, I go to an SSPX chapel. Among the indult crowd I do not see big families and in functions outside of church, I do not see the young dress any different than anyone on the street, wearing jeans, short shorts, spandex and such.
Besides all that, again you are comparing yourself to others, when we should be comparing ourselves to perfection.