Well, I suppose that maintaining your ability to produce testosterone naturally is not a priority at all: if so the Deca use doesn't matter in that regard.
As you are doing 15 weeks, then getting a fast start doesn't particularly matter either. But if it does, then yes, frontloading will be faster.
With the half-life of Deca being as long as it is, once or twice a week doesn't make a great deal of difference.
If you haven't used Deca before I'd rethink this cycle. If you have and are happy with your results and plan on permanent HRT or "cruising" and being dependent on HRT should you ever decide to discontinue cruising, then the plan may be fine.