This is no different from you asking us "Should I wear the solid top today or the patterned one?" Firstly, because it doesn't make any difference, and secondly, because not a single one of us gives a toss either way. We don't know anything about your writing, we know nothing about the particulars of either plot and moreover, whether you decide to write the first or the second, the likelihood that any of us will ever set eyes upon it - even if it does get completed, (which few stories that wannabe aspiring authors come here to prattle on about do), is infinitesimal. So you actually have four options, not two: pick the first story, pick the second, write both of them, don't write either of them. Best of luck in reaching a decision.