Tirzepatide is tirzepatide. If it's Tirz, there is not a 'better'. What 'better quality' means to me is:
1. lower level of risk (US shipping, test results, bank of reviews from verified previous users that are happy with their purchases, etc.)
2. ease of purchase (I've managed to avoid using crypto in the 1.4 years I've been buying grey)
3. guarantee that includes a reputation of backing the guarantee
4. longevity in the market
5. previous deep dive test results that have not failed (beyond the standard identification, concentration, and purity)
And at the end of all this is 6. pricing
I own and pin some Uther survo purchased through a group buy and I am pleased with it. Pricing was a consideration. I am mostly a Nexa girl.