I'd love to take my snorkel with me to try on masks, but the local shop doesn't have a wide selection. They have like 12 total masks, and 8 of those are pink and tiny for girls and kids. When I bought my first mask for OW cert, I tried on every mask they had, and picked the best one that fit, and yes I used a snorkel when trying them out. But the snorkel isn't anything like my reg + 7mm hood squishing my cheeks into a smile.
I've just come to understandment that some people have weird faces that won't seal on most masks.