While I'm a bit skeptical of the study - sample bias can happen (companies with unlimited pto may have younger workers who are taking less vacations to hit career goals) - I've reached the point where I, personally, prefer boring, simple contracts with clearly defined goals, perks, bonus, activities. Yes, those may change and naturally evolve in time, but should evolve to other clearly defined terms. No more stock options and vesting schemes, unlimited PTOs with caveats, etc. I'm fully aware companies will have HR and legal people working to create rules that optimize something that's not in my best interest, so I'll stick to what I can understand and predict.