I'd bet the only reason he suggests Honda oil (I'm guessing HP4) is that it benefits him in some way; maybe he gets a buttload of it cheap or something. It's not bad oil, but curious why he'd recommend it.
If you want to have fun, see if you can find something in your owner's manual recommending the use of Suzuki brand products and point it out to him. You'd think a Suzuki dealer would recommend Suzuki oil. Unless, as I said, he makes more money on HP4 or bought way too much and needs to sell it.
I use Bel-Ray. I have in all of my bikes. Works like a charm, haven't had any oil burners yet and I usually sell the bikes with 20-25,000 miles on them.