I have ran all 3. I think it depends on your application. no one carb is going to be perfect for every application. for ease of tuning I like the Edelbrock Performer/Carter AFB. its very easy to adjust without having to take the whole carb apart by just changing the metering rods. the key to performance with them is adjusting the secondary opening rate. they are pretty good from the factory, but it may not open fast enough for some applications. in which case it is very hard to tune as you have to grind some weight off the secondary air flaps. there is no method to it, just trial and error and if you go to far you can end up with a car that bogs. they also don't like off angles or washboard roads if you are in to 4 wheeling. I love the Qjet. it's most difficult to tune compaired a Holley or Edelbrock. But I find it holds a tune better than a Holley. the secondary's are easier to adjust than a Eddy. Plus the small primaries provided excellent throttle response and better mileage compared to a Holley or Eddy if you keep your foot out of the secondarys. if you can find one, Edelborck made some Performer RPM Q-jets that are just plain awesome. I believe the part number was 1910. they are rated at 850 CFM and kick ass when mounted on big block compared to the factory Q-jet. Edelbrock quit making them about 10 years ago. but rebuild kits and tuning kits are still available, if you can find one. I like the edelbrock Q-jet better than factory Q-jets. they don't have the porosity problems that the early Q-jets have. they are made of better materials, and don't warp as bad over time. the standard edelbrock 1901 was for divorced choke and works on 66-73 cars. the 1902 is for 74-78 cars with divorced choke, but is basically the same as the 1901. #1903 is for 75-85 cars with the hot air choke. #1904 is 80-89 cars with electric choke and 1906 is for big block trucks and has triple venturi for better fuel milage on a big block. 1901/1902 are rated at 750 CFM and the 1903/1904/1905 are rated at 795 CFM. and the 1910 is rated at 850. if you decide to go with a Quadrajet, defiantly get the book from Cliff Ruggles. he also sells pars and rebuild kits. his stuff is top notch and not the crap that seems to be at all the auto parts stores. I am not a huge Holley fan. you have to take the carb apart to tune them. and they always leak. I have never seen a Holley that has more than a 1000 miles on it that is not leaking around the float bowls or metering blocks. the power valves blow out all the time and they always seem to need a tune up. I ran a pair of 750 double pumpers on tunnel rammed L88 I stuffed in to a Hondo Flat Bottom Drag Boat. That thing wars terrifyingly fast and very loud. it was 105db at idle and deafening full throttle. I got kick off a few lakes because it was to loud. I ended up selling the motor to back to the guy back to the guy who was restoring the corvette it came out of. long story short those double pumpers were the only thing I could find that would not bog out on that boat, but they leaked constantly and always seemed to need a tune up and a new power valves. I just got used to carrying extra power valves and tune up kits any time I took it out.