Yeah I guess though once you get the blocks and Eo good it could be pretty fast for the last bit. Though if you do Eo during F2L I would completely agree that CFOP is better. I just really don't like doing rotations, especially during OH.
Yep, the last steps of Petrus are fast; it's similar to ZZ, but with guaranteed 2-gen for the last two blocks, whereas with ZZ you sometimes won't get that (although I think most ZZers do solve one block at a time). I think CFOP has the advantage in the earlier stages of the solve though, which is why it could maybe go either way.
Also, you would put roux before ZZ? I've not seen anyone else do that (for OH)
There are three key things about a good method:
- Efficiency
- Ease of fingertricks (TPS)
- Lookahead
Roux beats ZZ on efficiency easily. I find the fingertricks a lot easier too; not having to do rotations or L moves is really useful. Although FB is horrible OH, EOLine isn't much better. SB>EOF2L for fingertricks, and CMLLs are better than COLLs (on average). LSE and EPLL both have good fingertricks, though I think EPLL is marginally better.
Lookahead is the tricky one to look at. Both methods are rotationless(ish - ZZ can have z rotations), which has its advantages and disadvantages. Although you don't need to keep track of where your next pair/block is while rotating, which can be difficult in CFOP (especially keeping track of orientation of pieces), you do need to know what's in the back. ZZ had BL and BR, and Roux has BL/BR and
BD. BD is the hardest case since you can't see
either sticker, whereas with the other pieces you at least have some information. So rotationlessness is a bit of a disadvantage to both methods, but more Roux than ZZ.
Then there's the question of where the pieces themselves are moving. With CFOP, this is easy: either they're trapped in slots and completely stationary (thus easy to track), or in the U layer and visible. In ZZ, they can switch between the L and R layers. There also are a greater number of places both edges and corners can go in comparison to Roux, and to CFOP (for edges). Furthermore, there's also the fact that this is OH: with Roux your hand only covers solved pieces. With ZZ it can hide some things you need.
With Roux, on the other hand, everything is almost completely limited to being in one of two layers (except for the bit above FB). This does make looking for pieces easier. However the difficulty is greatly increased by edge orientation; with ZZ you don't need to care. You just need to know where the pieces are and you can solve the case. With Roux the edges can be easily flipped with just an Rw move - useful for solving cases, but bad for looking ahead, especially with one edge in the D layer. However with far fewer pieces to be looking for you can concentrate on EO relatively easily, meaning this isn't actually such a bad thing after all. I actually think that only solving five pieces makes lookahead
very easy with Roux, especially since it's only really two after you've started solving one block. This is probably the most important point but I can't think of a way of making it more than two sentences. :/
So I think the two methods are about the same with lookahead during F2L/B (Roux maybe having a slight edge), but then that's only half the solve. Looking ahead in ZZ LL is
much easier than CFOP LL. However, Roux has CMLL -> LSE, and LSE itself. I'd say this is even easier to look ahead with: I think Kirjava said LSE was "0-look" because so little is being solved at each stage you can see what's coming next easily. One last comment that's almost entirely personal preference: I find it easier learning what effect CxLL has on EO (for CMLL lookahead) than EP (COLL lookahead). You just need to know which edges are effected; with EP, you also need to know
how they are effected.
So yeah, you probably didn't want all that, but I didn't want to miss much out.
