Okay so I agree with Awesome_Typhlosion on the set comments, but I would suggest bigger changes mostly in the way you are building both your teams. You took sets from Smoogon, thats perfectly fine, I do that too. I would say they will mostly work better than anything you come up yourself, beacuse those sets are carefully discussed before being put in the Strategy pokedex by multiple people, mostly meta experts with huge amount of experience. So if it is not an absolute mandatory for the team comp and strategy, dont try to use anything that is not mentioned in the set commentary for the specific set.
So getting to the point, building a team consists from multiple steps which are described in detail on multiple sites over the internet. But that is quite complicated and if you just want to make a team built around a specific mon (normally you build teams around two mons -"core") it is best to choose mons that synergize well with it.
The thing is, I dont see any strategy behind neither of your teams. You have Lando-T as your defensive/lead mon and rest mostly sweepers (Mew is an execption). This is a definition of an Ultra-offense team, but even than you need some synergy between individual mons. Both your teams lose pretty hard to stall after Gengar, Kartana and Crobat are taken out and they lack any wallbreaking potential.
So what I recommend is to start over. Use Mew offensively instead of defensively (Mewnium Z) and build your team around it. Look into "Team options" in strategy dex if you are using that as your primary source. Also, you wont build a good team from mons you listed. First team is OU, but you lack Tapus who are almost mandatory for any OU team nowadays, no matter if it is stall or ultra offense team. Your second team is mixed OU/UU which from my personal experience wont end well. Celebi and Crobat are both OU irrelevant and you also lack hazard removal so Crobat is most likely getting stomped before it does anything useful.
So in summary: rebuild your team around offensive Mew variant, do not use any lower tier mons unless they have some use for your core team strategy are they are mentioned in "OU viability rankings", think of a core team strategy or build a balanced team (walls, lead, sweepers, support) that has lots of coverage and can deal with all kinds of teams
Hope I helped!