That's probably not the right question.
However, I know where you're going, so here's my .02.
Going active, DIY is more about price to performance ratio. You get a lot more for your money, and can be a lot easier to make sound good than a passive set where you're restricted to design of the passive crossover.
The JL 3-way will sound very nice when installed the way the manufacturer intended. The DIY 2-way is a quite a bit more flexible. A DIY 3-way can be a ***** to tune, but once you have it dialed in, it's bliss, and will compete with prepackaged sets costing many times as much money.
So, if you gave me, say a budget of $300.00, I could suggest a rock solid DIY 2-way (active) that would sound on par or better than a comparably priced prepackaged 3-way, that would be a lot more complicated to install (building kicks, etc). For that same money, I could design a 3-way that would knock your socks off, and be a good bit more flexible in installation, but you would need the processing to do it.
The L18 is an offering from Seas. Many of the drivers recommended in the DIY community come from Seas. Peerless, ScanSpeak, and Vifa are also major players. Then you have your Morels, Audax, Eton, etc. And, let's not forget Dayton. Vifa is a major supplier/builder of many, many car audio speakers that just stamp their name on the product. CDT anyone? Alpine, Polk, and many others as well.
Clear as mud????