Jelqing anyday. It takes time, about 2 months at least but it is a safe way to increase the size of the penis. Pumps are just temporary and they give you a harder erection, not a larger penis.
If you plan on using a pump, you will have to use it for pretty much the rest of your life to get that marginal increase. Jelqing however, you can try it for a couple of months and then you will not have to do it all or maybe do very little for the rest of your life to maintain it.