In summary, both EX and GX cards represent special, more powerful versions of Pokemon in the TCG, with GX cards being the more recent iteration introduced in the Sun & Moon series
Of course, look at the buylist price of that card relative to the next two
1 Dragapult ex is the Most Powerful Stage 2 Pokmon Efficient Damage Distribution Dragapult ex is the most powerful deck in the current format, and that is unlikely to change with the release of the next set, "Destined Rivals", at the end of May
Here, my primary concern isn't speculators or collectors but the poor college kid on Reddit trying to put together a Modern deck that ends up with fake Mox Opals off eBay, or the new player who thinks they are getting a good deal on some Modern staples to build their collection off Craigslist and hasn't played enough Magic to realize the cards are fake
Collectors love it because it blends a whimsical theme with powerful artwork, making it a fun but also valuable card to own