What's your budget/application? For pro use, I would highly recommend
SolidWorks, but at around $5k it's not really a home user type app.

SW is very intuitive. It is also very easy to go back and make
changes. Since it is feature based, one can make an edit and it will
replicate down through the tree and make all relating changes for you.

For a home/personal use, I can't make much a recommendation. Several
here have lauded TurboCad. I have heard Alibre is pretty good too. I
believe Alibre has a downloadable demo.

JW