Just made some outdoor furniture but not sure what to use as a finish.

Made a chair with some Douglas fir. The chair will have a cover when not in use.

Should I just use am exterior stain with waterproofing and be done with it?

Or should I use a stain and then steal it with some spar urethane?

What brands of stains do people like? If you have a specific product you'd recommend, even better.

Planning on using a pre-conditioner. Should I raise the grain as well?