Stick with the OEM, Motorcraft. Had 4 fail before the 15th birthday. Replaced all with Motorcraft, no misfire since. 11+ years from the OEM with a valve cover leak before first misfire, I can't complain.
I'm doing some more research. Will I need an ignition coil unit to go with the coils?
If you find one that last as long under the same or worse conditions, go ahead and recommend it.
I came out of winter 3 years ago with a VCG leak and misfire. Had VCGs and one coil replaced. Good for that year. Had a second COP fail in a year or 2, had it replaced, good for the year. Had 2 fail this year, had the remainder replaced, no more misfired for 4k mi so far. Would be nice if they lasted forever but they don't.
Guess I will tag every post that comes up like this with an update. Delphis going strong, year and a quarter now. 7 k miles. It's looking good, need any new ones yet Joe?