Should I keep my Triarii and Principes?

[econ21]

No, I haven't tried RTR.

Then I advice you to RUN, don't walk, to their website and download the mod[1]. It is amazing. They roll the gameplay back to MTW standards (ie slower, more deliberate battles) and do a great job of improving the historical accuracy of the units.

If the Roman army is your thing, you may particularly like the Roman campaign in RTR. They start out small: one faction, only three starting cities, no Senate and Pyrrhus' army banging on your backdoor. It will be too easy if you get too many Roman or ranged units, so I'd recommend you have half your stacks composed of allies or auxiliaries. I had to restart my campaign as it got too easy until I came across this house rule and then it was a blast.

[1] http://www.rometotalrealism.org