The above have been great answers to your questions. Other things to take into consideration might be the ability to move into the left seat of the Lear. Will you be a co-pilot forever? Don't laugh, many corporate jobs out there are single aircraft operations where the new hire pilot will sit right seat for pay etc for many years. If that is the case and your choice of airlines might be an RJ operator with an upgrade time of 3 years or less, then it is a no brainer in my book. RJ pay rates are typically (the big 4 rj operators) like this:
1st year FO 22,000
2nd year FO 30,000
3rd year FO 37,000
4th year CA 52,000
5th year CA 63,000 (line holder at COEX flying about 80 hours a month and picking up no extra trips)
These rates are ballpark based on the COEX pay scale which is going to change dramatically over the next year. Comair, Air Wisconsin, and ACA's rates are higher at the present time than what I've shown you. You must also realize that some companies will have upgrade times shorter than what I've illustrated and some will have much longer upgrade times (eagle). And just when you think you've got all the airlines rated by upgrade times it all changes and airline C then has a shorter upgrade than airline A. Getting confusing?
Like the others have said, you've got to do what's in your heart. If corporate flying is what you want, go with the lear job. I always wanted to fly for the airlines however I still can't help but to stare at a slick lear 25 when I see one.