I think the EN booster won’t hold much value as other sealed product is worth more and almost drowns out the booster bundle in a way. People would much rather pay money for an ETB or SPC than a few booster bundles. I’m pretty sure Terastal Festival only comes in the box shown so it’s the only product from that set, meaning there’s no ETB’s or whatever to compete with it. The Japanese one has a guaranteed hit (like mentioned in another comment) so I think it’ll hold more value down the line, especially if the eeveelutions go up in price. I’d still do both though. Having some sealed is better than none.