I have a GP Big Stik 60 ARF and Magnum 91 FS. What prop(s) should I get for this combo?

I was thinking 15x4 and 14x6? I know that a 13x8 works on this engine as well, but didn't think it would be a good prop for this plane given its design. What do you think?

Cost wise, the 13x8 props sure are A LOT cheaper than a 15x4, but I would think that a 15x4 would be a better choice for aerobatics given the high diameter and low pitch. Would the 15x4 be that much better than the 14x6?

Also, does it matter what kind of prop I get (material wise)? This is my first 4-stroke engine and am not sure if they are picky on what props they can use or if I can use wood and composite props. Can I use a basic Top Flite Wood prop?
So far I have looked at these props-

APC 14x6 Pattern* Propeller
Master Airscrew 14x6 Maple Wood Scimitar Propeller
Master Airscrew 14x6 K Series G/F Nylon Propeller
Master Airscrew 15x4 K Series Propeller
APC 15x4W Propeller

*Does the "pattern" designation have any significance?

Sorry for all the questions, just want to make sure that I buy the right props.

Thanks for the help!