Turion 64 is very good in terms of performance and price, when it comes to BAT backup, the centrino had more backup than turion in idle mode, when its in full load ,turion gives 10% more batt backup.
Performance is more or less similar because for turions ,AMD gave more preference to clock speed to cope up with Intel PentiumM .The price compariosn will clearly indicate that its directly compared with clock speeds when it comes to comparison of Turion - Centrino , for ex 1.6 model,1.7 1.8 2.0 and 2.2 .2.2 with comparison to 2.26 P-M.Both the Chips , when compared has nearly the same WATT ratings , 28W and 24 WATT etc . The reason why the Turions are not being able to cope up with Centrino in BAT backup in Idle state is because it still uses DDR400 compared to DDR2's in P-M's which uses low power .This problem should be resolved in Jan when AMD will introduce DDR2 based solutions.Also Turions have S 754 with single channel controller.
The difference between the two procesoors in WATT rating is due to the fact that AMD's has the Nothbridge on board,whereas the Intel P4's has it on the mobo.