Having built 20 or so F-86's in 48th scale, for my preference, it's:
1 - Hasegawa
2 - Academy
3 - Revellogram
I've only used Hasegawa kit decals once and it was the F-86F-30 RCAF kit with decals for 416 Sqn (three colour camo and the big yellow "X" worn for Exercise Carte Blanche) and 413 Sqn (NMF). I went with the 413 Sqn decals and they were very good. A little thick but they settled nicely with a bit of Solvaset. All other decals have been aftermarket (CanMilAir, Leading Edge and Model Alliance) for RCAF Sabres.
The Academy has a good representation of a General Electric J-47 engine. The fuselage comes in two halves but if you want to display the J-47, you have to paint the engine and separate the fuselage halves into four pieces; left front and rear and right front and rear. There is a line engraved on the inside of the fuselage to guide you in scribing or cutting. Either way you decide to go, you have to build the engine because of the design of the kit. The front of the engine keeps the intake runner in place and the cockpit is glued to the top of the intake runner. The exhaust pipe mounts to the rear of the engine and that's required if you want to keep the parts square.
The Academy and Hasegawa kits are almost identical with a few minor plot twists. Yes, the Academy is cheaper but I find the Hasegawa a better fitting and easier to put together kit. I don't mind paying a few extra bucks for convenience.
If you can find the Revell Germany Canadair CL-13 Sabre 6 (blue box with a Luftwaffe jet on the front and Luftwaffe markings only in the box), it is the exact same kit and plastic as the Hasegawa kit and it's cheaper than the Hasegawa and Academy offerings.
The Revellogram kit is the cheapest of the lot but it's also, in my opinion only, the worst of the bunch. The intake trunk is moulded closed about a 1/2" back form the opening. It's not a very convincing depiction of the FOD covers. It also allows you to model the jet with the machine gun bays and speedbrake wells open but detail is sorely lacking. Closing them up is your best bet. The wing fences (F-86F-30) are molded onto the wing, as is the pitot tube. Be careful not to break off the pitot. I was fortunate. It also has separate landing flaps but fixed ailerons. The flaps on real Sabres NEVER drop when parked. The main gear struts are VERY flimsy. Be careful with them. The two things that I REALLY like about this kit is that the makers have indents for vents on either side of the fuselage (1/2 way down the fuselage just aft of the canopy) and they vent along the spine, just in front of the tail, is flat like those built by Canadair. The dorsal vent North American built Sabres was bulged. All my Sabres are RCAF builds.
Then there's the Italeri rebox of the old Esci kit. I've read a few reviews and it seems a bit of a dog to build. I've never built it so I can't offer fair comment on this kit.
Ultimately, it's your decision but I hope I've provided you with some information to help you make an informed decision.
Best of luck with your project.
Mike