Which lake is better?

Much depends on your primary interests. Though both are great for boating, swimming, fishing, water skiing, etc., there are differences.

Lake Powell is huge and much more scenic and also offers more in the way of hiking, camping and a more laid-back type of experience. Lake Havasu is more of an attraction for the younger crowds and the lake (as well as, the city of Lake Havasu) is much busier/crowded, especially during the summer months.

I've been to both and I prefer Lake Powell but I would imagine you and your buddies might prefer Lake Havasu.

http://www.lakepowell.com/
http://www.utah.com/lakepowell/
http://www.golakehavasu.com/

= Millerton Lake is nestled interior the foothills of the Sierra Nevada, approximately 12 miles east of Fresno, California. Millerton Lake Marina is located in Winchell Cove at Millerton Lake State entertainment section.

Lake Havasu is ideal spot for family vacation. It provides crystal clear water and sunny sky.

Lake Powell.