I dont think it matters dealers choice. On my set up the lags were easier to get to with a wobble extension due to a side panel that made the bigger nuts harder to swing off.I've never pulled a motor by removing the screws holding the mount, always removed the top nuts and rear bolts. It might be easier to do so I just have never done it that way
Only thing I don't like about removing the lags is messing around with a penetration into wood. Mine are gooped in there pretty good with 4200 now.I dont think it matters dealers choice. On my set up the lags were easier to get to with a wobble extension due to a side panel that made the bigger nuts harder to swing off.