My favorite is the Ulforce V-dramon deck (ST-8). Powering up more when your hand is large and returning your opponent's cards to the hand is a fun style of play. The card art is also good. Dracomon and it's evolutions look beautiful and there are interesting details like the Digibeetle from Digimon World 2 in the background of V-mon's card.
It's either ST01 the Gaia Red deck or ST08 with UlforceVeedramon. UlforceVeedramon was the first real deck I built, that being said Gaia Red comes with good cards and needs a rerelease in the States. :/
Considering I incorporated most of both of them into my primary deck, ST01 and ST07 for sure. Yes it's exclusively for the Greymon family cards, no I do not care