The grass may well look greener but your tales of woe in the airline industry are often replecated within corporate too. I began in corporate then a brief spell in the airlines and back to corporate and although I will vote for the biz jet every time it doesn't suit everyone.
Be careful about where advice comes from. The Seneca/ Kingair crews have a different outlook on life compared to the Gulfstream/ Falcon drivers with markedly differnt pay and conditions. Citation/ HS125 somewhere in the middle I guess.
One point that is well worth considering is the usually complete lack of or extremely flexible roster. It can be difficult to plan ahead like you can with an airline roster. An understanding partner is a must and even then AIDS can strike! (Aviation Induced Divorce Syndrome) I believe it began in the corporate sector of aviation
Good luck