If u are going for hot models eg daytona or new pam releases, it is really subject to stock availability at the dealers. So making a "buying trip" specially for these models may be risky if there are no stocks.
If u happen to be on holiday then by all means buy if price is cheaper than sg. Need to do ur homework by checking out local AD prices and grey dealers offerings (if u dun mind getting grey sets).
Have fun shopping!