The Bandai PG Falcon is an impeccably detailed, high-quality, plastic model kit. It replicates virtually every part of the original 1977 five foot Falcon. It takes time and a bit of skill to assemble, and must be painted.
The EFX product, which I've only seen in photos, is a commercially painted finished product that replicates the 32" Falcon from 1980's ESB. It's not a kit, seems to have vastly less surface detail, and seems to have a rather contrasty heavy-handed paint job. But maybe that's not fair of me to judge it, since photos may be misleading.
Nonetheless they're very different products with different markets.