As I see it, you basically have two choices... carbon steel or bi-metal. For me, it comes down to how much steel (and what type of steel/material) you'll be cutting and how much of it you're going to cut. For my money, I would go with carbon steel for wood and aluminum. For steel is where I would have to make a decision. If I was only going to do a little cutting and my saw ran slow enough I would go with carbon steel. If I were to need to do a lot of cutting in steel I would have to make up my mind whether I wanted to go through a couple of carbon blades or maybe just one bi-metal. Another thing to consider, is the steel you're going to cut "good" stuff, meaning no burnt edges and/or possible hard spots? That can ruin any blade in a heart beat! If the material is "unknown" in this regard I rather risk a carbon blade than a bi-metal because of the cost factor.
In my home shop I only use carbon steel blades for everything. But, there are a few points here: I have a coolant mister and use it to help keep my blades cooler. My saws run slow enough. I have a blade welder and make my own blades. I got really lucky and picked up a few hundred feet of various TPI NOS spools of carbon blade stock. This really cost me nothing since I sold some of it for what I paid for the whole lot!
When I say NOS, I mean old! There are recommended cutting speeds on the boxes for different materials including asbestos!
I've found that carbon blades will last me a long time as long as I don't need to cut high carbon or alloy material. That's another story, but I can just weld up another blade that costs me $0.
I know many swear by bi-metal only for metal cutting and I can see where in a lot of cases this makes sense for them. As with everything in life, "it depends" on your individual situation and usage.
YMMV,
Ted