Dell vs toshiba computer

Whats your primary use for the laptop? and budget?

You'll need to be a little more specific on the model numbers.

For the Toshiba P6200:
P6200 refers to the Intel Pentium Processor P6200, not a model number.
Which Toshiba laptop family are you referring to Satellite, Qosmio, Portégé, Satellite Pro, Tecra?
What is the screen size?
What is the model?
Is it the Toshiba Satellite L645-S4102 or some similar model number?
What is the price?

For the Dell Inspiron N4010:
Is it the Inspiron 14R Laptop?
What is the price?

What are your usage requirements and budget

For reliability it's Toshiba, but there's not enough info to determine if it may or may not meet your requirements.