I have done both. From a purely practical point of view, "normals" may prefer the shorter travel time via HEL. A few extra hours at home or the office is a consideration. But we're not 100% normal here, are we, (myself included)? HEL is a bit of a drag because of the 2x3 hours in short haul aircraft. The last 3 hours on the return can be really painful when you just want to get home, but QR flights are a chance to just get more sleep / rest. I even find QRs old slopey seats to be ok ish but obviously aim for the newer planes. I really like AY otherwise - service is great compared with BA. But QR is streets ahead of both.

If you haven't been on QR and can spare the extra few hours, definitely QR.