From the view point of legacy recruiters RJ PIC time is still significantly more valuable than Airbus SIC time, which is only slightly better on the resume vs RJ SIC time. In the short term your resume might look slightly better (while taking a higher risk of a failure here) vs a regional FO with everything else equal but once the RJ FO quickly upgrades they will most likely get a call before you. Yes plenty of people are hired without TPIC but why purposely put yourself at a disadvantage for a lot less pay. Upgrade is slowing as the list/airline shrinks with attrition. In the last year all of the small amount of upgrades offered have gone to 6 years on property except 1 award that went 4 years. Regardless your timing into this industry is great overall and the fact that you're taking the time out to analyze the best path to your final destination is very smart. Best of luck to you.