Learn English – “In doing so” vs “In so doing”

"Which" is more formal when asking a question that requires a choice between a number of items. You can use "What" if you want, though.

Generally speaking, you can replace the usage of "which" with "what" and be OK grammatically. It doesn't always work the other way around, however. There needs to be a context of choice. For example:

Which/What flavor of ice cream do you want?

• Either is fine, but "which" is better.

Which/What do you want for dessert?

• "Which" only works in the context of being presented with choices (e.g. a dessert cart right in front of you).

I'd think both are acceptable, but 'doing something' sounds much more natual to me,
because I don't feel the necessary to use 'having done something' form.
If 'having taken' were required in that sentence to mean the taking occurred in the past,
then other similar verbs like 'remember', 'forget' and the like
would have to need 'having done something' to express 'the doing' happened before.

      I remember you saying that Nathan was such a bother.
      (I remember that you said Nathan was such a bother.)

Simple use of the gerund form 'saying' is good enough
to understand that 'your saying was in the past.'
So my take is there would be no difference between them,
and I might use 'having taken' for writing in a formal way if I had to use that form.