Get the standard edition, buy the season pass on sale when all 3 DLCs content are released.

At this point, I don't really like where the direction of the game is going. I like the main game, really do. But with the latest Masamune DLC, all TN has done was add 3 missions, 1 difficulty, a "new" weapon which isn't even new at all since it basically just rips off the moves from the spear and axe, then also nerfing almost every thing under the sun. Oh and PVP is unplayable at the moment.

So... yeah, get the main game which would tie you near 40-50 hours of gameplay. See if you want more after that and then decide.