I like many of the cards added into the theme decks... Yet sadly, in the Theme Deck format online, I don't think either of them can match up to Dark Hammer and the pre-constructed XY basic color decks. Why? The draw support is abysmal in comparison to those decks. -_-
And since I only ever play online, I'm definitely going to pass on the Lugia one. There's no point in playing a Pokemon that is strong against EX in Theme Deck mode, and it isn't strong enough for anything else. I'll have to play against the Zygarde one a few times to see if it is interesting enough to merit picking up, but you're right, they aren't as good as the basic decks.