If you can find the inconsistency in the records, adjust things as needed for the number you know is accurate.
If you can't verify what is accurate and what isn't, go with the most conservative of the two. Having an accurate, conservative, logbook is a lot more important than 10-20 hours in the long run. It isn't likely that the regional will request times from your previous employer, but if they do, it would only cause a problem if you showed you had more time than your employer shows.
I can't tell by your message, but do you already have job offers at Compass and ExpressJet? If not, I won't try to get into why you're already leaving your current employment, but just know that it is much (much much much) easier to get a job when you currently have a job in this industry. Being current and actively flying are a lot more important in an interview than 10-20 hours in a logbook.