For most applications I'd say wire works fine. Lakes further north can be quite turbid and less pressured so pike are generally not line shy.
However, necessity is the mother of all invention. I'm a bigger proponent of jerk baits. I find myself mesmerized and somewhat inspired by watching a slow twitched lucky craft slender pointer in slack water, over some deep cabbage!!
Those who know what I'm talking about agree that wire adds weight to your leader and is an eye sore in clear water. And there's nothing worse than seeing your bait nose dive on a pause.
That's where fluro comes in. A 100% fluro leader will be virtually invisible to fish, and a leader that’s tied without metal is way more buoyant than wire.
Problem is as some have pointed out is you tend to floss a lot of fish with fluro. And losing a $20 bait really hurts and it can harm a fish, so the heavier the fluro you use the better.
I won't go under 80lb. I've seen too many break offs on 50lb.
Problem is, you can't really field tie an 80lb leader. You have to secure the loops to hold your terminal bits. The obvious solution is crimping wire sleeves over the loops. A good crimping tool will do a good job, and it looks great, but it just ends up adding more weight.
For the past few years now I've been using braid to secure my loops. It's a fraction of the weight and its very low profile. I basically use a rod wrap knot and 100lb braid with hardener to bind the braid to the line and to seal the knot and prevent it from absorbing water and slackening.
Kinda looks like dis.
Since I've switched to fluro, I'd say the number of hook-ups versus follows has gone up tremendously. It's a confidence thing though. If you're confident about what you're throwing you're going to focus on your presentation, the retrieve. You can work a bait as slow or as fast as you want, giv'er wide rips or gentle sweeps. You'll want to crouch down and focus on what might be happening to your bait somewhere down there in the abyss. All because you know that your leader isn't hindering the action of your finely tuned bait.
cheers
HD