I've got a mix of Earl's, Evil Energy (Amazon), FaSSter (eBay), Snake Eater, Fragola, A.C. Performance, and Summit fittings and am happy with all of them. I have not wet-flowed my fuel system but have air pressurized everything to test the connections.
It's smart to try and get all your fittings from one supplier, as you can assume they'll fit together the best. Every manufacturer is producing parts that are supposed to fall within guidelines and meet tolerances but mixing and matching has the potential to cause issues. I seem to have gotten lucky. As 86 Salon said, don't play that game with hoses & fittings though, unless you're absolutely certain they'll work together.
The Koul Tool is nice but doesn't work with PTFE or Evil Energy fittings, just a heads up.
Avoid using CPE rubber lines for anything other than vacuum, spend the damn money and get the PTFE lines that will outlive you. Yes they're more expensive, but they're basically impervious to chemicals and they can take the heat a little better. Ya gotta pay for quality somewhere in the build, but I saved some coin by going with Evil Energy hoses.
When buying hoses be absolutely sure to check the I.D. and O.D.- don't just go by the dash size or you'll be in a world of hurt since not all -X AN hoses are identical in size. This is where you can overheat a transmission, starve an engine of fuel, or try to assemble fittings and lines of two different sizes. And that's why you normally avoid mixing brands.
Get a small tabletop vice, perhaps one that clamps onto the workbench. They're very affordable at around $20 on Amazon and also at Harbor Freight. Sometimes a big vice is just in the way.
You'll also want some aluminum or plastic jaws for said vice, lest you markup your fittings, which are also around $20.
Wrap the area you're about to cut with electrical tape to contain the soon to be frayed stainless/ nylon wires. You'll want to cut the hose with an electric or air powered cutoff wheel since teeth will only grab and jerk.