I used to do a lot of fishing, coarse and sea, but alas now the only fishing I do is Fish Wrangler...
Pollack prefer a rock habitat, mackerel are shoal fish in open waters so the rod you get is dependent on the waters - for rocks best go with a shorter rod generally. I used to use a 10 footer but that was from a beach. The 9 footer would probably be the safest but check for rod strength and where the eyes are in relation to the rod itself.