Molten is cheaper and I think gives more storage, but most modules don't use space in forge and you can make separate games as different instances of foundry, so it's a question of (price and storage) x features.

So I switched to Molten, which is fast and stable, as if I was running it locally. It doesn't have the Bazaar, but I'll take the trade for stability and easy of use. It also has easy FTP and WEBDAV access for managing assets, whereas The Forge was always a pain for moving around assets.

The Forge (Game Master Plan) Cost: $4.49 a month or $47.99 a year ($4 a month) 3GB assets data ($1.50/GB or $1.33 when buying for a year) - Can be upgraded. Maximum File Size is 50mb - Can be upgraded. Servers in East NA, Europe and Asia & Oceania.

Molten Hosting, for Foundry VTT: As Seen On The Internet! Copy link. Your own private server. With servers worldwide, you can get up and going in under 5 minutes. Built for FoundryVTT. A simple, turn-key solution for remotely playing the most popular VTT. Bleeding-edge Cloud technology.

TL;DR: 1) Cloudflare tunnel and self host on your own server/PC 2) renting a cloud server such as linode, digital ocean, aws, google cloud and azure (recommended by my own personal favourite to my hated) 3) use noip.com for port forwarding.