I was thinking of buying both books are they worth investing in?

In my opinion - No

You would be better with Bob Chuch, Goddard, Patterson or Roberts.

Great photographs but most of the patterns are very difficult - I've been tying over thirty years from size 32 to 5/0 Jock Scott fully dressed so I hope I know a thing ot two.

Do you want to spend an hour trying a fly only to snag it up a tree first cast?

Having said "no" - depends what pops your cork, I go for minimalism myself - being a lazy git.

On the contrary I would say yes. The detail is very good and there are a lot of techniques that you will benefit from.
However, some of the patterns are complex (I wouldn't say difficult) but you can adapt a lot of them to make them a little simpler.

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Bill doesn't say how experienced he is at tying?

The books are packed with step by steps which while some seem to like, personally I don't - a dressing list and a photo or two suffice for me.

I suspect a lot of people will love the book, much as they love Wyatt's.

If you like to experiment there is scope within the book.

I would suggest that you'd find ample variety in Church's "the new fly patterns...", or his other books, based around more standard flies.

Steve also tries to write prosaically, and again some may love this, but even to me I can see poor writing, with qotation marks ignored then misused. "There" used when presumably it should be "they're".

Also "it's" "its". Homophones - its and it's

"pupa's" when it should be "pupas".

Why learn grammar? well if you're trying to write lyrically it is sort of expected, like you'd expect an upcoming pop star to know what a pentatonic blues scale was.

I think it is a unique book, with lovely photos that takes you on a unique journey, so good in that regard.

The narrative seems awash with "riffles" of all types, and like Chris Dawn's prose in Trout Fisherman of old, it is liberally sprinkled with birds on the wing.

If you have a good book collection already, and you can indulge the flawed writing, then this is a niche addition, if you have one or two books only look to my earlier suggestions.