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the main prerequisite is weight
Only if you're competing at a weight-weenie contest. In all other cases, it's worth prioritising durability, rolling resistance, aerodynamic drag, ride'n'handling and ease of maintenance (not necessarily in that order) over weight.
gbj_tester-
Indeed, well aware.
Not normally s weight weenie but at the moment building a 1x10 hill climb bike do as I can train for a trip to the alps.
I suppose by best I meant something that encompasses several of those factors but will also help me up the hills. As I never normally look at weights and finding accurate reports seems to involve a reasonable amount of google searching I've resorted to hive mind.
At the moment fulcrum racing 3s seem best bang for buck without going handbuilt tubular
BlackMath
Probably overall quality, the main prerequisite is weight.