easiest extremes/ultimates/savages?

[TomsYoungerBro]

Unsyncing Extremes and Savages while working your way up to current content is a really nice way of ramping up to the harder difficulties this game presents. Sure the level 50/60 and so on stuff will be easy, but at least you will be working towards mount rewards (do the last tier of each savage...A8S is a minion instead xD). Once you start hitting the 80s you will start having to look up guides for certain mechs to prog through. This will give you a good feel for how it will be like with just a smaller sample in each fight . As you get closer to current content, the more you will have to learn. Eventually you will be caught up to the current content!

Then as some have said: Ultimates are UWU -> UCOB/TEA -> DSR -> TOP. So I would consider getting your feet wet with UWU (once you are ready!). It doesn't hurt to fresh prog any of these once you unlock them (for fun), but I would highly suggest not actively pursuing true raid progression until you've caught up and started doing current savages.

[Xlantaa]

Ultima Weapon is the easiest ultimate, about savage, Alte Roite. If you only want the current tier, then Ps9. Extremes... I can't tell.

If you are looking to start doing hard content, then current tier Extremes are a good entry point. Zeromus is a pretty straight forward fight, no really hard to learn, then Golbez or Zodiark. Once you are comfortable with extremes, you can try with savage. I would say P9S is the easiest on this tier, but in my opinion, is a big jump from extremes still, so you may require good preparation if you're not used to this type of raids.