I put a Simmons 44mag on my .270 Handi. It's the 3.5-10x44 with the duplex reticle. I'm very satisfied. It's held up to cold and rain well (no fogging) and has held zero for the last 18 months, with regular shooting. I also used it to assist in taking my first deer this season. I put the Simmons 4-12x40 ATV on my 204 Ruger Handi. I haven't had a chance to really test the ATV, but it also seems well made, and it is bright and clear. I really don't think you can go wrong either way.
good luck,
cricman
Long Live the Handi-Rifle!