(This is a longer post so skip to the TL;DR if you want. Just need some advice)
So I got back into TCGs in general about 5 years ago. Started with Digimon first, then quickly got into Pokémon because it was just so cheap and easy to find a league. Got super serious with it, and ended up selling my Digimon collection because I needed money for Pokémon and I was just not playing Digimon much anymore.
I wanted a secondary game to play besides Pokémon, and tried out Lorcana and Magic but bounced off both pretty quickly. Now with the Digimon renaissance we're in right now with Time Stranger, Alysion coming up, etc, I've decided to start over and get back into the card game. I've been watching a lot of videos and reading up on what the meta is like. Been watching Beatbreak and loving it, saw that Glowing Dawn was a great deck with more support coming(as well as Data Squad/ShineGreymon to a lesser extent), so I picked up 2 of each of the starter decks, a booster box of BT25, and some extra packs that I found at Target. 8 BT25 and 8 BT21(I saw that BT21 has some useful cards for the ShineGreymon deck so I figured it would be good).
Here's my question: Where should I go next? From what I've read it seems like power creep is still a problem with this game so I don't want to waste money by buying old booster boxes if they are not that relevant anymore, but should I buy an EX12 booster box? Seems like TB is a great deck and that I could get a really good start on building the deck from buying a box. Should I do that or is TB not worth investing in? Definitely going to get a box of BT26 when it comes out because it has Glowing Dawn and Data Squad support. My only other question is should I get a box of AD-01 since it has a lot of staples and reprints, or is it not worth it as a new player?
TL;DR Should a new player starting from zero just purchase a box from new sets as they come out, or should I get any boxes from older sets? Is EX12 and AD-01 worth getting? Thanks everyone!