You have opened up a really big topic, i.e. fertilizers.
By rights one really should do soil analysis to see where it is at and where it needs to be. Last year after taking samples I bought a pallet of fertilizer containing phosphorus due to clients lawns and my own being deficient. The Govt. has taken this necessary ingredient out of fertilizer for normal consumers. Phosphorus promotes root growth and makes turf much healthier. The results were very good.
Generally straight urea 46-0-0 is not spread, it is sprayed in fairly diluted rates but frequently, i.e. golf courses. Growth is very short lived but works extremely well. If you really want incredibly green grass, mix in some iron in the spray and within a day grass will an unreal shade of green.
What I can tell you is you get what you pay for in fertilizer. It all boils down to the rate of release, a good portion of your nitrogen is lost through leaching and volatilization. Rate of release is controlled by coatings, they types are:
1. Sulphur coated, not ideal but better than none.
2. PCSCU, Poly coated sulphur coated urea. Much better as it has a much more predictable breakdown rate.
3. Rxn, This is not coated at all, but the nitrogen is stabilized to avoid leaching and volatilization. This gives a good 6-8 weeks of slow release.
I use a LOT of 33-0-5 W/2% Iron. Have had really good results for years. This is the biggest seller of the vendor I deal with and is what the golf courses use. Golf courses don't buy cheap fertilizer.
Here is my yard and it gets a good 100 trips a year through it with truck and trailer hauling wood.