My view; try both.

If you like one better than the other, enjoy it.
You already have RB and Reaper has a free unlimited trial version.

In my experience; for simpler, as mentioned above, I already knew PT so RB was very intuitive. If you cut your teeth early on in the computer recording timeline RB/PT should be pretty intuitive. Also you can continue to work in a BiaB mindset (generating tracks, or portions of tracks and even multiriffs). This has a huge benefit for small project studios. However, if you cut your teeth on Adobe (for instance) another software may be much more intuitive for you.

For me, if and when I find I need to move from RB I do, but until then I find the features available in RB too inviting to move to something else before I need to.
Many of my requests for work/help come from PGMusic based projects, so RB is the right choice. When a request comes in for something done in another DAW, I adapt and keep moving on. The differences are often just in personal preference, so try them both and decide for yourself. Which is better/easier/simpler depends on the need and your personal history.

If you know BiaB, there is a good chance you'll appreciate RB more. Without a knowledge of your previous workflow it is impossible to guess which is better for you, really.

If you've never used any other DAW to begin with, I'd suggest RB simply because many features of BiaB can be accommodated. Moving to Reaper, then realizing you can't generate the same drum sound for another 8 measures can be frustrating.

I do not work here, but the benefits are still awesome
Make your sound your own!