I'd believe your Suzuki tech.
Under warranty (and even afterwards) I'd NEVER use anything but an oem filter. Ive been involved in more than a few cases where warranty assistance from the vehicle manufacturer was denied because an aftermarket filter leaked enough to lunch the engine.
And for what? The expense of a fluted oil filter cup wrench, a ratchet, extension, and maybe a universal joint?
Provided the filter is correctly installed, you dont even have to think about the oil filter, it's filtration, construction, or operating characteristics. On..and DONE.
True, you cant simply go to your local AutoZone and buy an oem motorcycle oil filter. But I order them online 3 to 5 at a time, saves me time and $$, and running around. In the rare case when Ive run out and forgotten to restock, I'll make a ride of it and pick up an oil filter from the closest dealer.
From the manufacturer's point of view, why would you pay for damage caused by someone else's part?
The last one I remember was the lady that came in with a relatively new Mazda, her car was on the tow hook.
She was pissed, immediately told the service advisor.."My car is making knocking noises, smoking, and IT'S UNDER WARRANTY."
I bring it in, no oil shown on the dipstick, the aftermarket oil filter seal blown out--could have been left loose-- and the service advisor brought her back into my stall to show her. A call to the district rep, "Sorry, not our fault--take it back to whoever changed your oil."
It's your bike(or car), do whatever you want, use whatever you want. You'll do that anyway.
I just prefer oem for various reasons.