The good points of going the fine wire direction, you will have one more way to harness the built in performance of your engine program. You are able to adjust more than just a heat range setting. The fine wire plugs can take advantage of what the newer style coils bring to racing. When combined with a completely balanced/blueprint ignition setup will provide you with a better overall package to race with.
The down side to these plugs is cost of purchase. The normal racing operation is use to paying a much lower price for sparkplugs. And when combined with a fully balanced/blueprinted ignition system are going to wear out at some point in time.
