Gaffers is the grippiest. Each tape has it's own good qualities though. Electical holds up in moist conditions but it's slippery, especially when it's wet. Still, it won't come off. Gaffer's doesn't like moisture but it's the most grippy under most conditions. Metallic tapes are pretty but have sharp edges that must be covered or they will cut you as they start to tear. If you use metallic, put it down first and then cover the edges with either gaffers or electrical. Hockey tape is also grippy and holds up pretty good in moisture. It's just heavier.

If you look in the header of this tribe, you'll see links to many threads discussing all of these and even some videos on how to do it.

Hope this helps! Good luck. You'll do great, no matter what you decide. It's all part of the learning process.