Does the Minternational Pass price vary depending upon the country one would use it in? It doesn’t look like it:
Airalo (and probably other similar markets for international data SIMs) is considerably more cost competitive albeit for data only and unless willing to employ workarounds 
, an eSIM capable phone is required.
On the other hand, depending upon phone, it may be possible to route Mint talk & text over the international eSIM’s data connection. It’s definitely possible with iPhone but Androids would need to support backup calling (not all Androids do so).