OSBot has some really good scripts, but emphasis on the word 'some'. The selection is limited and a lot of the developers just don't put the effort in to update their scripts or they release them with a lot of features missing, and try to charge a premium for it.
Check the local scripts section, a lot of people do release free scripts which are flawless (I've got several 1-99s with free OSBot scripts previously, although most are now sadly removed or outdated).
TriBot does involve paying for VIP, but there's a great range of free scripts and a lot of committed scripters to provide and update them. I'd say if you're just looking for occasional botting try OSBot to start with. But if you're going to be doing a lot of botting consider investing in TriBot - because it is easily possible to make the cost of VIP back.