I would go with 3. Definitely flatter than 1 and comparable to two. Not the prettiest drive but some of it's nice. You are sticking to interstates so driving

I would go with 3. Definitely flatter than 1 and comparable to two. Not the prettiest drive but some of it's nice. You are sticking to interstates so driving pressures should be minimal. I-5 has a lot of elevation changes, it also takes you through the most traffic..