I’d explain it like these.
‘These are the gaskets that the manufacture provides. I think they are okay quality but due to their nature, construction, and thickness they can have a tendency to leak causing an annoying exhaust leak or ticking sound. I can gladly use them however I recommend Remflex which ‘guarantee’s no leaks which is a far superior product. They do cost $49.90 but we think they are worth it.
Then if you want to explain it further you can tell them your shop rate is $150/hour and if the tti ones leak, not only will tti not warranty them we wil. Also have charge however long it takes to change them out, approximately 1-1.5 hours.
Then let them choose.
I know what I would pick if a shop addressed me like that