I've yet to try the spikes. I'd like to see how they compare in traction capabilities. I've heard almost all no answers when I inquired if they were as good as felt.
The felt argument is more complex than most folks like to realize. Tons of things transfer the species that they're trying to keep out. Birds, boats, boat trailers, a wool fishing fly, pants, gloves.....etc. A large portion of blame are handed to felt boots mainly in part to their lengthy drying process. Also, this is circumstantial depending on the actual water that's being dealt with. Climate is a big factor. Felt boot banning is but a very small band aid on a huge wound.
I will say though that if any help at all is to be offered then it's better than nothing. That being said, I don't know that it's worth being injured in a remote area just to try and use a different soled boot. Use what's safe for you. I've seen rocks that felt can't "shake a stick at" in regards to traction. I know rubber or spikes aren't going to save your bacon.