Here's what i say
MD-Call Energy+Eeveelutions. Few common staples, mostly crud. 2 of the X's are nice but it'll suck if you get Porygon Z LV.X(Garchomp, Glaceon and ESPECIALLY Leafeon are all still worth a fair amount)
LA-Pixies, Pixies, etc. Also has the vastly underrated Gliscor LV.X line. Also does have some crappy cards but great for rogue players and metagame players alike(for staples and the Kingdra), trainers aren't bad either.
SF-The big "3" of Gengar Machamp and Gyrados, great for metagame players. Also has Dusknoir whose play should increase next year, as well Tyranitar SF who still makes a decent. Don't forget Gigas whom has seen some play this year as well. The trainers it has a several trainers not in other sets(Energy Link, Poke healer,drawer, blower and Luxury Ball all of which are decent/good). The secret rares are also worth decent amounts too, the Charizard SF can fetch 20-30. Also Shiny Duskull is always a nice thing to have although no DP Dusky anymore
PL-SP ENGINE and the toolboxish componets is the main thing here. Also has good X's in Shaymin LV.X(land), Giratina LV.X, Dialga G LV.X, and Palkia G LV.X, even Drapion can be a decent rouge, same w/ shaymin. Also has BTS and lookers as well as Galactic's HQ. IMO your best bet as PGX isn't god like anymore but still playable and DGX got 2 Top 8 @Nats. the secret rares are all worthless, the shinies bite, although Vulpix still sees play, then the haymaker reprints are worth nothing.
RR-the big one. Comes w/ the most notable SP and it's first "partner"(Lux GL X and Ape 4 X). Also has Flygon and Nidoqueen. 5 Eeveelutions but the rest of the X's are pretty crappy, Mismagius X, Kazam X, Snorlax X. Some are useful, somewhat, Gallade 4 and Floatzel. Also has the overhyped Hippo X. Trainers, nothing too special besides, volkner's and radar. A reprint of Bebe's too. Other secret rares are baddish, the rotoms are all average except Fan and Frost. the pikachus are terrible.
SV- Has Garchomp C X and Blaze FB X. Also has the "new" draw engine perhaps in Star FB X. Absol G X is okay and might see play when LL comes out here. Trainers bite, but Cyrus I. is seeing play. The Reprints are terrabad and not worth much either, first set to give you 3 X's. But most of them stink and the best one is in a tin
PA- Great set for normal rares, similar to SF, in that it has a "big 3", CurseGar, Spiritomb and Expert Belt, other than that the set bites, as Sally and Tangy were overhyped, lots of SR's w/ the arceus but those for the most part suckish too, can pull a complete SR set in two boxes if lucky
HGSS-Yeah this set wasn't great either. Honestly about 5 good cards used right now, Jumpluff, Donphan Prime, Communication, Collector and Double Colorless Energy, Copycat's play should rise but most of the primes can't even be played. Potential though. Not to mention how suckish the shiny+legends are.
UN-A good set though, Kingdra Prime, Judge and Entei Raikou legend are the main things to go after, but there is potential for rogue players in this set too. Not bad but not great either, lithograph is probably worsest card on the planet.
UD-This is based on speculation but this should be our best HGSS-on set yet. The legends are crud but it offers THREE good primes, Espeon+Umbreon and Scizor as a nice tech, again another round of eeveelutions.
The trainers are okay as there is a near reprint of Team Galactic's Mars. Also has Vileplume too.
So yeah just make your decision, hope i helped.