High TL 9 vs TL2+RPM

[Anaraxes]

Originally Posted by Nereidalbel

If they can identify the gene that gives access to Magery

If Magery is even genetic in the first place. The OP didn't specify.

The desired post-war setting might influence that choice. Is the original population gone? Still a few magic-wielding refugees? A subjugated remnant? Co-existence with the invaders, with varying possible degrees of hostility? In some of these, you might want magic to remain the exclusive province of the aborigines. In others, the invaders might take over magic along with everything else, or might need it to maintain their foothold.