Penske is usually the better deal and here's why...

1) unlimited mileage with Penske
-- (Uhaul hedges this by including their extra-high mileage rate into their quote and then providing a "free mileage" allowance)

2) Penske trucks are often newer and better maintained the U-Haul.

3) Everyone knows that you're carrying household goods in the U-Haul -- but in a Penske truck it could be anything -- thus increasing the perception of security

4) U-haul uses speed govenors (really, really bad idea). Penske doesn't .

On the other hand, a lightly-loaded truck can be a bear to drive in windy conditions.

For my money, I'd still choose Penske over U-haul.

Mark