Advice Time v2.0

I want to get a pedometer/step counter. But I'm torn between two.

Do I get the standard everyday one that calculates steps, distance, and calories, and switches into "Aerobic mode" once you've been walking a decent speed for more than 10 minutes (I think that's for more accurate calorie counting)? (£11)

Or the better model that does the above and also calculates your metabolism and has an exercise mode that calculates intensity in METs, records your exercise "units" (the equivalent of one MET-hour = 1 Exercise unit) and gives you a weekly goal of 21 exercise units, and keeps track of your progress toward the goals (£22)

Which would you go for?