Id say I have “sturdy legs” as you put it, find modern jeans too tight on lower thigh\above knee area (no I’m not obese :P) and found some comfy pads for once.
I bought some Endura MT500’s after looking at a few different pads. Went on a 3hr ride at Swinley forest last week, bit of everything xc\jumps\mini single track downhill stuff and they felt good. I almost forgot I had them on, kept my knees nice and warm as it was 10c.
They are a bit pricier than some others but seem well made and feel comfy. I went for M\L, if you are a rugby beast of a build then maybe L\XL.
http://www.endura.co.uk/Product.aspx?dept_id=104&prod_id=400