I have an AVG cart and FujiNet. I only use my AVG cart - they are close as far as capabilities, it's just the AVG cart does more. I don't think anyone mentioned it, but you can also swap operating systems with AVG; takes three key presses and done. All without opening up the case. With my AVG, I am running 1MB ram, fast SIO and can run cartridge, floppy and cassette images. I have a 32GB SD card that I literally copied everything to, and done. The menu is lightning fast and searchable. You can also map drives that stick so on the next powerup they're already there if you want.
SAM is fun on the FujiNet though...