As we saw with Prismatic Evolutions, brand new, pack fresh Pokemon cards can be even more valuable than well-known vintage cards like some of the original Rockets Pokemon
Flat misses are a problem though
How Trading Cards Are Printed Most trading cards, including Pokmon and Magic: The Gathering cards, are printed on large, room-sized offset lithography printing presses, which print in four primary colors: cyan, magenta, yellow and black
Discover holo, promo, alternate art, Illustration Rare, ultra rare, vintage, and modern Simisear cards from across the Pokmon Trading Card Game.
Tailss small toughness, therefore, is not all that important
Both have their pros and cons, but Id ultimately choose the latter as its easier to spend mana on Castle Vantress than to rely on having a legendary creature on your side of the field to activate Rivendells ability