The 5 arm means you'll find new rings easier to get/fit.
The one piece spider/big ring is great as long as spares/support if available.. oh wait it's Shimano - built in obsolescence as standard! (post 1993)
( this is my personal opinion and I'm usually full of crap )
I often found it one of life's ironies that Shimano's prettiest and most useful chainset, the 737, was replaced by it's ugliest. I really disliked the 739 from the start.