For someone new OSBot/vInsert would be be best/easiest.
However I am a huge proponent of Simba , amazing community and if you put in the time and effort you will get great results.
I hear much more about OSBot than vInsert, however I've never used either, but from what I've read people are happier with OSBot.
i recommend simba, its the one i use, the only down is there are not many flawless free scripts out yet, so if you want a completely falwless one you will probably have to pay, but there is still a few decent free ones.
I use osbot, never tried vinsert but i looked on their site today and their saying that they were hacked and account information has been dumped. As far as simba, i tried to use it and it sucks, color bots really fail imo.