(now granted this is from a chaos player PoV) If my rhinos are starting on the board i always take pintle mounted havoc launchers, 48" s5 ap5 twin linked small blast why yes please. but if its one of my outflanking chosen rhinos i just keep em cheap 35 pts. For loyalists I would take HK missiles if and only if i can take at least 10 of them (preferably more) (rhinos, rzrbcks, dreads, etc.) to have an unlimited range krak missile alpha strike