first off there are are couple.. things...
what elo are you..
have you ever jungled before?
what is your playstyle
out of all the jungler's i play
is by far the easiest out of the junglers i play
she has a VERY easy clear.. she is mobile and has a form of cc.
she can build tanky or damage
she is by no mean the "best jungler" but she is very beginner friendly for those who want to learn the role.
if your trying to learn jungle for the first time your going to need to pick an easy champ.. not necessarily the "best" one
good starting jungler are

more complex ones are
and
(only because his ult can very very hard to learn)
and then we have the much harder jungler that are VERY skill intensive such as
