our team is thinking about making a new website but we don't know
which version could be better to achieve a new project. I know Rails 3
is newer, suppodsely better and so on, but what about gems & plugins?,
are they ready for last version of Rails?,
Keep in mind that it's unlikely plugin/gem authors are going to be working on new features for 2.x.. I wouldn't anyway unless I absolutely had to.
are there more tools we
could use in 2.3.x than in 3?, are hostings ready too?.
Heroku does at least http://docs.heroku.com/rails3
I use SliceHost myself which is just a VPS so can do anything I'm able to setup.
question is less important because we don't know when the project will
end, so maybe when it's finished hostings will be ready.
If you don't have any idea when it's going to be finished, I'd say definitely go with 3.x.
Any advice or idea?
Before you do anything examine your project. Look to see if there is anything stopping you from using 3. That should make it clear which to go with.