MUCH MORE IMPORTANTLY...
• it is SUPER straightforward to use parallelism here (as you have already pointed out)
and...
• this type of sentence will ALWAYS have parallelism. (you can't write 'the more xxxxx, the more likely yyyyy' unless you actually have parallel ideas xxxxx and yyyyy.)
in other words, it's pretty much a waste of your time to pursue these choices beyond basic parallelism.