substat pro or matrix?

[gypsy3]

hi all.. . which is the best media....opinions please

[ILLUSN]

whats your application?
in a canister substrate pro has more surface area (hence better colinisation in a smaller space) matrix is great for sumps, less surface area but a better service life.

substrate pro is 450m/L (4500000cm/L) matrix is 160000cm/L.