How close are you to hitting your Reserve Retirement? When you mention started retirement package does that mean you can retire immediately because you have reached your qualifying age to get your Reserve Retirement? There are some pros to MEB since you have LOD's and that would result in immediate retirement via Chapter 61 retirement so if you aren't there and are only being moved to the Retired Reserve than its a no brainer to MEB.
Even if you could retire immediately due to hitting age 60 or less with qualifying deployment there are additional benefits of a chapter 61 retirement such as waved annual enrollment fee for Tricare select, possibly having pension exempt from federal income taxes if one unfitting condition is designated as combat related by the PEB, and your total unfitting conditions DOD% is higher than your earned longevity of your Reserve Retirement and your pension could be more than your earned reserve pension with it being as high as 75% of your High 3 base. That would create a higher floor for earnings without relying on VA compensation via CRDP or CRSC.