I would do some EQ work first, T/A last for final touches.
Anywho, I originally went active because I had an older set of Type X comps, blew the tweeters but wanted to keep the mids. I knew using different tweeters on the X crossover was a no no, so I went active.
That was my original plan, but that eventually evolved into a head unit with the ability to do a 2-way front + sub, which eventually turned into a 3-way front + sub.
Now, my goal is a better stage. Width that can extend beyond the a-pillars, and depth that has me thinking I've got a band on my hood.
It takes a lot of trial and error to achieve this. Between proper installation, and knowing where to adjust your tuning, it's a lot of work, but the end result is worth it. Even when it takes a good month or two before everything is finalized, I enjoy the end result.