Possibly the single biggest advantage of trolling lures is that it works well on all species. All species of billfish including swordfish, as well as mahi, wahoo and massive tuna are all a possibility - you just never what is going to bite next!
The basic rule is the more ground you cover the greater the odds are of you finding a fish. No technique allows you to travel as fast as you can when trolling lures.
There is a lot of ocean out there and gamefish are getting increasingly harder to find these days, which is making lure trolling a more and more effective technique.
So if you are up for the challenge then go artificial and head wide.