Elder-Basilisk
First Post
There are plenty of plus points for Levitate too--you don't need a wall (and can't be attacked by creatures with burrow/tremorsense), you can levitate objects (try using Spiderclimb to raise a portcullis), you can use it to cross chasms or water (contact with the top few inches of water should be enough to allow you to move), etc. And the attack penalty is largely irrelevant if you're tossing spells instead of arrows.
Spider climb does have its advantages but it still seems significantly weaker than levitate.
Spider climb does have its advantages but it still seems significantly weaker than levitate.