definitely the paid bot, but if you want fast mage exp and I would use automta pro. I do the alching only, its 70k exp per hour and you had do 24 hours straight no randoms cuz its minigame =p
In general I stay away from both auto clickers and Alchers. Every time I used them on my accounts they all got banned, actually lost 3 very good accounts. How ever you are better off with RsBots alcher because the clicks on both the alch spell itself and your items your alching are all different rather then clicking in the same exact spot over and over and over again. In other words it's less of a chance of getting banned.
The auto alcher has a big ban rate, I wouldn't recommend it. But gary's autoclicker isn't, imho, better. I would buy another magic bot to get your magic levels. If you can afford it, buy RiD's MTA, it's the safest bot out there.