Comparing NCL San Juan City tour vs Shore Excursioneers Explore Historic sites Walkin

Hoping someone has gone one or both of these excurstions. We are going to San Juan in Dec. on NCL Gem for anniversary. Right now we have their City Tour booked. They don't have many to choose from. We are looking for a casual, sight seeing tour, especially forts and Old City. But I am reading somethings that the ship tours are packed buses and rushed. The cost is only $10 more for the excursion thru Shore Excurstioneers and seems to be slower and less people. Thoughts?? pros and cons on either? Reviews in general about what you see or don't get to see? Thanks for any feedback!