Hokkaido telco coverage

Will be spending a week driving around Hokkaido – involving Asahikawa, Biei, Furano, Asahidake Ropeway, Sapporo and Cape Kamui.

Currently considering few options for telco:
SoftBank eSIM easily available, just wondering if their coverage is good enough for these places (mainly asahidake ropeway, just a short hike and back)
Or should I go for a physical Docomo SIM card instead?
I have Ubigi as well, but it’s a beeet pricey.

Any suggestions will be great, thanks in advanced!

by WallabyNo1688