Redundancy is a good thing for fire starting methods. They generally do not occupy much space.

A BIC lighter is a great tool, and I ALWAYS carry one. One hand usable, fairly reliable and does not need special tinder. However, I have experienced many failures of these, mostly due to physical damage or the fluid leaking out because the button was depressed. I also always carry UCO or REI stormproof matches, but these need a good striking pad which must be kept dry. No matter what method or methods you carry, something can go wrong and it is good to have an alternative. If your adventures are not so extreme, then maybe you do not need such redundancies.

Along with these fire starting methods, I always carry good tinder. It can make all the difference.