I can't answer your question about an RSP vs RRSP, but I do recall vaguely that the RSP is for a company pension. Generally individuals open an RRSP.
But I want to point out that you don't "invest in an RRSP". RRSPs and TFSAs are not investments. They are places to store your investments, that are registered and treated in different ways by the government.
In other words, you can have stocks, bonds, GICs, or cash in an RRSP or TFSA. A bank that's offering 2.05% is probably selling a GIC, I'm guessing. If you're investing long term for your retirement, I recommend you read up on how to invest in equities. They're more volatile, and of course your principal isn't guaranteed like cash or GICs, but you have a lot of time to weather the ups and downs, and your money will compound over time.
The Canadian Couch Potato website is a great place to start your research. At your age and income level I would focus on the TFSA, and would invest in a balance portfolio of equities. But you need to do the research and figure out what you're comfortable with.
Eta: if you're using the funds for a home buyers plan or education, then you are allowed to withdraw tax free from an RRSP, but you have to pay the money back in 15 years, I believe. And in that case a GIC would be fine, but you can also do this with a TFSA, and you'd be able to reinvest it at any time, with no restrictions.