OEM. You can bet Volvo engineers have done more Volvo specific
research and testing on this question then any after-market company.
The OEM parts work very well. Plus, you get new 15mm bolts for
the pad assembly when you buy OEM rotors (Volvo says the bolts should
be replaced and I'll go with their engineering on that issue). Flush
the brake fluid with DOT4+, too (this can be hard to find so I use
Volvo brake fluid, too). Brake fluid should actually be flushed every
two years according to my owners manual.

One of the things Volvos are best known for are their excellent brakes. There are a lot of other parts worth upgrading, but in my opinion, original Volvo brakes are the best.

Gordon
--
86 240 DL 120K; 98 V70 XC 125K(Bilsteins, ipd strut tower brace & sway bars, Wetterauer chip)

OEM, Period.
--
'82 240DL Stock / Masters Class, '94 850 Fully Loaded / Daily Driver, CVC / VCOA Member http://www.capcan.com/tonyg.htm

I always look at brake posts because many are quite funny.

You should do a search - I've seen

Squealers
Rumblers
Vibrators
Pulsers
Brake pads that refuse to work in the rain

Many people who use non-OEM pads end up paying twice as they have to buy pade to replace those that make too much noise.

I've had at least 20 brick brake jobs, never had any noise with OEM. Most Volvos that we have purchased had other pads, and all made noises until we went back to OEM, although we usually toughed it out until the pads were worn enough for replacement.

--
96 855R, 95 855,854, 90 744 Ti - 340,000 Volvo miles put on 7 bricks