progression - RPG level-experience formula

I want to make an RPG game and I would like an advice on how should I create my level-experience formula. I saw this formula http://rsdo.net/rsdonline/guides/Experience%20formula.html#PHP and I created a formula myself and I want to ask you which would be better.

    RuneScape rates                     My rates

    Level 2 - 83 xp                     Level 2 - 35
    Level 3 - 174 xp                    Level 3 - 84
    Level 4 - 276 xp                    Level 4 - 150
    Level 5 - 388 xp                    Level 5 - 238
    Level 10 - 1,154 xp                 Level 10 - 1,087

    Level 100 - 14,391,160 xp           Level 100 - 311,017

As you can see at level 100 RuneScape's xp is very big and my level 100 is equal with RuneScape's Level 61. Is it better if the xp grows very fast at one point or depends on how I make my game?