In order from heaviest/most functional down to lightest:
Clearing trails: Atlas 40V brushless, Harbor Freight, $99. I don't own a property with woodland on it any longer, so I traded my Echo for this - one less carb to keep cleaning and running smoothly. I own a Katanaboy, but I only use it around the house if I forget to charge the Atlas' battery. It's just too big for me for most other purposes.
Multi-day trips where my load is shared with partner(s): Silky Gomboy 300.
Multi-day trips where I want a "real saw" but a want to save a few ounces: Silky Professional F180. IMO this is an under-appreciated product. Folding handle for easy storage, same Silky quality as a Katanaboy/Gomboy but at a realistic "field carry" weight.
What I loan out: Outdoor Edge Grizsaw. This is a not-as-well-known OE product that in my opinion is actually a really well-made little device. It has a nice, locking plastic sheath and the blade handle has a steel reinforcement in it so it's rugged. The cut of the teeth is suitable both for bone and wood although like many hybrids, it's not as "fast" in either as a dedicated-task blade would be.
Lightweight Backpacking/Hunting. Silky Tsurugi 200m blade. I cut off 1.5" from the tang to save weight, then 3D printed a basic "handle". This is my lightest "real" saw at 3.4oz, while still being extremely functional and fast cutting. Since it doesn't fold I use a piece of plastic trim that came with a set of car wiper blades as a protector and just hold it on with tape.
Day trips where bone would be my first priority: Havalon Talon Saw Blade. If I'm hunting I probably have my Talon with me because I use it a lot for field dressing. Havalon makes a saw blade that isn't very long and works OK for smaller stuff. The cut of the teeth is best suited for bone but it will definitely cut wood in a pinch.