Really depends on who made the kit.
Several years ago I had Monogram's 1/48 F-14 Tomcat (still holds up well by todays standards) and Fujimi's 1/48 Mitsubishi F-1/T-2 kit.
The Monogram kit will go into modeling history as a classic kit, the detail was spectacular for the day and still impresses today.
By contrast, I'll be happy if I never see the Fujimi kit again. Dull, dull, yawwwwn, dull! No specific detail, decal instrument panels under large canopies that showed everything, generic ejection seats and overall poor engineering to boot. I couldn't believe that a Japanese company could let themselves do such a lacking job in properly capturing one of their nation's own domestic products.
For 1/48 you usually don't go wrong with Monogram kits. Their A-10, F-14, AV-8B and F-101 are all good even by todays standards.
Most companies can handle 1/72 pretty well. Italeri has made some trully stunning 1/72 kits. Their 1/72 T-45 Goshawk was a beauty and I'd build it again anytime, their 1/72 Panavia tornados are also well done.
To my mind, 1/32 can be a hit and miss scale, some otherwise good companies can get into problems with it. The latest reissues of Tamiya's 1/32 F-14 are awesome, but I remember what it was like on its first issue (wish I couldn't remember).
Check kit reviews before buying anything. The same company that made a drop dead gorgeous kit in one moment can make a dog of a kit the next. ICM's 1/48 Spitfires are awesome in everyway, on the other hand, their 1/72 MiG-31 Foxhound is a dog's breakfast (no pun intended).
Whatever scale the most respectable representation of the subject comes in that still remains in my price range is the one I try to go with.