Thanks for this. I checked them out and they sound very interesting, do you recommend that I begin with one of them or is it fine to read them concurrently?
It depends! If you want to see unusual examples of applied maths or a bit of thinking out of the box, focusing on techniques and not theory, start with Howison's. Logan builds theory alongside applications and is, therefore, heavier on maths. If you're confident with graduate level physics though you should be fine with both.