I came 5 minutes late to Maariv at shul X where there are more than asara mispallelim. Should I try to quickly catch up and then daven SE (doable, though I will need to rush), OR go to shul Y where they did not start davening yet but they do not (and will not, possibly) have asara mispallelim?
On the one hand, I am makpid to daven with asara mispallelim (not 6). On the other hand, it would be a chesed to help Shul Y where they are constantly running in the street looking for more people. Should I forfeit tefilla b’tzibbur to do a chesed (as I said, I hold that less than 10 mispallelim is not tefilla b’tzibbur, as was the psak of Moreinu HaGaon HaRav Moshe Feinstein in Igros Moshe 1:28).
Daven in the first minyan, because there you surely have tefila b’tzibbur, but at the second place you only have a safek about it. Don’t try catching up even if it is “doable”, but daven SE first and then go to the beginning and say kriyas shema and it’s brachos.