USPS or FedEx with delivery confirmation?

[quick_check]

Should I send my N400 application by USPS Priority mail or FedEx with delivery confirmation? Any problems with that?

Curious to know what option majority of you guys used

 

[Mr Vertigo]

Use USPS. I sent it as First Class Mail, with Delivery Confirmation. It arrived in 2 days.

 

[jac2005]

Use the Flat rate envelope (Priority) and add delivery confirmation with USPS. Costs like 4.80 + .80 (approx). Fedex will charge you through the nose.

 

[rick92]

United States Postal Service Priority or Express Mail is the cheapest.- Always use delivery confirmation.-

 

[quick_check]

Thanks guys! I will also use USPS with delivery confirmation!