Advisories on MOT's are at best a subjective opinion of the tester at worst an attempt by the garage to get some work on the books. To be fair In most cases it's the former, it really is a finger in the air, testers have a fondness for highlighting theie own "favourite" areas, my guess is that your MOTs where probably done by 2 different testers. Some issues on the car are also variable in the evaluation of what is an advisory or not. Usually the things that make it on to the sheet are warnings of wear and future potential failure. Some testers also like to cover themselves if something goes wrong down the line, expecially brake and supension components, so you are likely to get things like "worn bushes" or "brake pad material low" etc. Can you tell us the advisories you had in both MOT's and also if the tester was the same?