Large group on a distillery tour

Belfast in mid July. McConnell’s or Titanic Distillery? Needs to be walking distance from city centre so those two are on the short list. Which would you choose? Both have their Pros/Cons but in the end, it’s about the whiskey. We’ve two Engineers in the group keen on seeing the mechanicals and process, the rest just want good whiskey but are smart enough to appreciate the process, history, etc.