Nice, Panda you ever use the 43CB roughers? I find they can drop the power about 10% depending on how they're being used. They're meant to be ran at a lower RPM in order to draw more torque from the spindle, but that high torque comes at the price of stressing the living hell out of the toolholder. I actually prefer weldon flat holders in some situations...there's always a bottleneck somewhere.
I've used S/Z carb in the past, mostly on contract jobs and the suppliers like them since they're easy to source. I like their bottom plunging geometry. I wouldn't say I go to SGS first, but I often end up with them after looking around for something that's non-standard, like a tapered ballcutter or solid carbide feedmills.
Myself I prefer Destiny Tool and Lakeshore Carbide for aluminum cutters. Their flute geometries seem to be more aggressive compared to Swiftcarb, Accupro, OSG, SGS, etc. Destiny makes cutters with deeper flutes, but the Lakeshore versions are generally cheaper (probably because they have less markup by selling direct). The thing I like about Destiny endmills is they're larger toward the bottom and have modified flute geometry to strengthen their corners, being as the corners wear quicker than the rest of the tool. They last so long, I'm more liable to drop them than actually wear out by cutting. However the downside is the modified flute makes it harder to plunge or helix/ramp aggressively. Generally need to drill a plunge hole or back off with the entry helix speed. Very application specific.
I used the Accupro progressive helix cutters with some success, but they have the opposite effect. The bottom of the cutting edge is the weakest part by far. They make a great finish but almost always ended up snapping off in a pocket somewhere. I prefer the standard high helix Accupros. Funny, Accupro used to be probably the cheapest high helix endmill around (aside for Lakeshore), but their prices must have increased somewhere along the years.
I tend to say most suppliers can give similar results as long as the cutters aren't asian garbage. I think everybody goes through a phase where they want to buy up cheapo carbide from ebay or whereever, but then gradually realize the uselessness as time goes on. In the past I worked a string of automation cells where I was handling the robotics side of things and couldn't touch the machining end, so I could only shake my head at the guys buying endmills that squeak into corners, leave cloudy finish, make rubbing sounds from excessive RPM, leave a tapered wall due to flexing (usually with the aforementioned cloudy finish) etc etc. It's enough to make a grown man cry!