It does not make a difference if you pull it while it is hot. The boston butt will remain hot for more than 6 hours if you wrap it tight in foil and then put it in a cooler and cover in towels.
For the 3 pork butts I did for New Years, they finished about 1pm and I needed to keep them warm till I pulled them at 6:30pm. The pork butts were still very hot that I couldn't pull them with my bare hands and still had to use the pvc gloves that I have.
*Weber Mini WSM* *Weber Touch and Go Performer X3* *Sublime Smoke UDS* *Maverick ET-732 * World's Fastest Blue Thermapen **Pitmaster IQ110*