I hope to make this blog a reference point for Disney Anakin's scaling. Anakin is in fact more powerful than Yoda in the force. These quotes come from the book Skywalker: A Family at War, which was released this year.

ROTS Anakin > Yoda (in the force)

The quote saying he has "superior strength in the force":

The previous passage reveals that his "superior strength in the force" is with regards to the Jedi council, which would encompass Yoda:

Now some may try to counter this by pointing to Anakin's defeat against Obi Wan on mustafar, in which case I'll point out that Anakin was emotionally hindered on mustafar.

Anakin was hindered on mustafar

The book doesn't outright say "he was hindered", but the quotes are very similar to the same ones used in Legends to justify hindered Mustafar Vader and IMO its really clear once looking at the quotes.

Firstly, it's best to start by showing how Knightfall Vader is described as. The book likens him to "a droid executing his programming" clearly showing he is cold and calculated:

Knightfall Vader is also described as "disturbingly calculated calm":

On the other hand, Mustafar Vader is described as being infused with the "strength of his fenetic emotions":

Now what were these emotions exactly? Not the kind that would be useful.

Mustafar Vader is described as feeling despair and experiencing self loathing:

Also experiencing insecurity and feeling terrified:

The word 'frenetic' is defined as:

To give an example of this word being used in the same book, ESB Luke is described as 'frenetic' and contrasted to the calmer and more focused ROTJ Luke.

The way ESB Luke is described as 'frenetic' to the calmer ROTJ Luke is pretty much equivalent to the way the calm and calculated Knightfall Vader is compared to the overly emotional Mustafar Vader.

Knightfall Vader is explicitly referred to as calm, cold and calculated whereas Mustafar Vader is described as being overcome with emotions of terror, self loathing, despair and insecurity.