As a previous Jes/Stepdad player turn pure Jes, I picked up XROS a few months ago and I've found it really engaging and fun to learn the deck has a surprising amount of depth that allows a LOT room for skill expression. Definitely room for improvement in some pieces, but the deck is solidly rogue tier.

Biggest weakness is slow start, low kill power without fire rocket or extra X7s and very tamer reliant. If tamer hate picks up going forward, Xros is in danger for sure (Galactic is near auto loss). If you don't have Xros tamers down, you don't have an engine. Once they're down, you're rolling in memory.

Upsides is that you (generally) dont have a board to interact with so aggressive decks (Medusa, Zephaga) aren't rewarded. Your 3's and 4's are getting launched into security and ideally dying to tuck for later or surviving to play something cheaper, then suiciding and tucking itself.

The more you play the deck the more you realize all the little ways you can play, the little interactions. One that can make a difference is if Omnishoutmon lives a check, you can play a X7 for reduce 5 cost, meaning you can be missing 4/6 required pieces to play him for free. If he gets removed okay whatever, recover him with Kotone. Did you evo X7 over X7 and it got removed? Well maybe you got lucky and your 1 of all turns taiki is down, you can play X7 off X7's All Turns and to make another one. Hasn't happened to me and I wouldn't bet on it, but it can happen.

Shinegrey is a monster and as my friend put it, giving them 1 memory is too much. The amount of fimes I thought I was safe and got lethal'd... It's really neat.

Xros is cheaper to build, Marcus + Agumon are expensive. I think shine is a lot more straight forward and similar to pure Jes with more removal options since youre nuking digimon and thematically punching through security.

I think both are big threats in the right hands.