I too have read most everywhere on the net that the Simitar editions were the best for these Godzilla releases. But I did read somewhere that the letterboxing is simply a pan & scan version with the top and bottom chopped off to make them appear widescreen! If this is the case, I'd hate to pay top dollar for these out of print discs only to have a doubly butchered presentation.
“Why do you beat my son so hard?”

“Because he’s a beast—an animal! And someday I shall have to destroy him!”