Now, if you're thinking "Yoda you're so lazy, you keep using the same thing!" you'd be wrong; I went through a series of iterations, trying to perfect the formula that I'd stumbled across this DPL and ended up with this (okay, maybe you are half right). This was the first week I actually used Defiant Thundurus in a DPL game, despite having used it on some earlier versions of teams from other weeks. Around then I came to a realisation about the current DUU meta, that it's very offensive and often a lot of turns come down to who can move first and KO the opponent. There are some good bulky Pokemon (e.g. Tsar, Suicune), but I find in many situations that it's difficult to switch into a given Pokemon, especially Thundurus and Naganadel. As Demantoid pointed out, I believe this is why Landorus-I isn't as good now, because Pokemon are faster or bulky. Compare this to DOU, where I feel Pokemon are generally bulkier, and switching into Pokemon is easier. Games can be (but aren't always) 20+ turns, with a lot of pivoting, which contributes to the usefulness of SR. Whereas in DUU, games are nearly always ~12 turns at the most (I just looked at some DPL/DUU Showdown games and this seems to hold).
Due to the metagame trends I've tried to describe above, I really feel that Aerodactyl is a good mega in the current meta. When speed reigns supreme, Mega Aerodactyl is king. Rock Slide needs no introduction, and Aero's other moves can be used to round out what your team needs. Aerial Ace is a solid single-target attack, Aqua Tail most notably hits Krookodile, and Fire Fang can catch Mega Scizor and do actual damage to Metagross. One of the main selling points of Suicune is being fat enough to near guarantee Tailwind, which Aero can also effectively do as a result of its high Speed. It can position itself to sweep with the right offensive partner, doesn't require using a setup move itself, and can support teammates with Tailwind. Tree also summed it up quite well.
Anyways, onto the actual team. There's three fast attackers (MAero, Darkrai, Thund) and three bulkier things (Entei, Tsar, Suicune), which combines the two elements of the metagame mentioned above. Starting with the classic FWG core, Entei is an all-around solid Pokemon being able to tank and deal hits with a decent Speed, Suicune is fat and a reliable Tailwind setter, and Tsareena is a useful pivot for supporting the team. I'm a big fan of this trio (or something similar e.g. with Arcanine) as the backbone for a team. After that, Darkrai is a great offensive partner for MAero, as I mentioned before. Defiant Thundurus is such an amazing Pokemon, with Defiant being especially useful because I have three other physical attackers, and it is another good teammate for Aerodactyl. I'm very happy with this team, which I believe to be the most well-rounded of these teams, and to be potentially sample worthy.
I beat Howfalcons with this team, in a game which I think shows how the offensive core of the team works great against slower stuff, and how the bulkier part of the team can be used to manipulate the board position into a favourable board position, with Tsareena being used to stall out Tailwind then pivot in Aerodactyl safely as it ended.
https://replay.pokemonshowdown.com/gen7doublesuu-907941976