I think generally torches fall into 2 categories.
1. Well priced torches, with a half decent spec but an unregulated power supply.
2. Torches from companies which specialise in torches, have regulated supplies, are often waterproof, have adjustable beams but you pay a premium for them.
It is all personal choice and likely to hinge on how often you need a head torch and what you are comfortable paying.
Trail running mag have a head torch test in their latest issue and their best in test is the Hope Vision R4 costing £250. Probably more of a torch than 95% of us actually need.