Good replies…
Because I have the cams and a digital scale here are some weight comparisons for cams of the same range:
Red #1 Black Diamond C4: 136g
Red #1 Black Diamond Camalot: 158g
Green #1 Metolius Powercam, old version: 114g
Green #1 Metolius Ultralight Powercam: 98g
Purple CCH Alien: 124g
Red Link Cam: 180g
Blue tricam with tape (for stiffness): 60g
Brown tricam with tape: 54g
This is how I would rank BD C4s and Metolius Ultralights after using both:
Weight: Metolius
Durability: Metolius (harder aluminum in cam lobes)
Range: BD
Ease of placement: BD
Ease of retrieval: BD- Metolius have a real tendency to overcam when you place them in a hurry, a serious flaw in my view.
Holding Power: Metolius claims a slighter angle and higher holding power, but it all depends on the rock and placement quality in my opinion.
For me, when climbing near my limit, the weight of the gear is almost a non-issue. Ease of use is much more important.
Black Diamond C4s, for most people I know, are simply easier to place and retrieve than any other cam due to ergonomics and this makes them popular. Both companies have very good quality.
Slings:
I personally do not like the 8mm spectra slings from Mammut or the 10mm from BD. They last maybe two seasons before they are so fuzzed they have to be retired… but I do keep a few for ice climbs and alpine, just not for regular use. I have gotten very good durability out of Bluewater’s 13mm Titan runners
8mm Mammut Spectra: 18g
13mm Bluewater Titan: 34g
Biners:
BD Neutrino: 38g
BD Hotwire: 44g
Trango Superfly Wiregate: 30g
Camp Nano: 30g
DMM Spectre:34g
DMM Shield: 36g (my favorite- feels as secure as a locker)
Wild Country Helium: 36g (another favorite)
Ease of clipping matters to me, so I do not like the Nuetrinos or the Camp Nano (terrible to use). The Superfly clips better than both, though is still a little small for my big hands. I often have a Neutrino or Superfly on the gear end of my trad draws with a Hotwire on the rope end.
Everyone is correct- passive is the way to go to lighten up.
Nuts- anything offset and DMM are awesome, which seems to also be the consensus.
Lastly, I always recommend that people borrow other racks for a time before buying. You have to find what you like, as most major companies make quality gear. Perhaps for you there will be so little difference between BD and Metolius in use that the weight will be a factor, but you won’t know until you place both a few dozen times.