Nope.. compression fittings only mean you don't have to worry about using hoseclamps to tighten the seal around the barb.. The flow is the same as both compression fittings and normal barbs go inside the tube, you can get 1/2" id compression fittings aswell, the only issue is that compression fittings require more space than normal barbs. I'll try to explain how they work..
You've got a shorter barb than usual, meaning less hose gets over the barb, but instead of hoseclamps you've thread a screw/nut on the hose which then screws on over/around the barb, which does 2 things: 1 it locks the hose to the barb and it makes it watertight.. it's called compression fittings because the screw/nut compresses the hose against the barb.. It's easier to do maintenance on since you don't have to cut cableties or unscrew clamps.. But it's really down to preference.. Compression fittings also are more expensive than normal barbs.
Since I've recently bought from aqua-computer I know about their compression fittings.. But Innovatek also use them. Koolance offers both normal barbs and compression fittings.
The thread on the compression fittings are as standard as anything else.. Aqua-computer sells G1/8 and G1/4 threaded compression fittings with 11/8 and 10/8 sizes. Koolance have quite a bit more to chose from.. But be aware that they do take up more space on your block so 2 of them might not fit next to eachother if it's allready a tight fit with regular barbs.
There's also a third kind of barbs, which utilize the entire ID of the hose.. That's using thicker and way way stiffer hoses. So far I've only seen Asetek (waterchill) and Aqua-computer (Plug&Cool) use it (system names in '()').. That's even easier than compression fittings, but alot more care have to be taken when cutting the tubes so that it's a even and nice cut.. The Push-in systems have the same threads as regualr and compression fittings aswell

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so.. it's just a matter of what you prefer.
-Bubba