Buy my game Ready setup and be happy.
Or just take a Look on it then you know what to do

without to explain a lot
You can rent it too , to see how stuff works out for you
the main problem i see is you keep killing mobs with 1K+ hp while using a lr 20 , thats like 30 somewhat dps ?
i recommend you to use a better weapon before thinking about rings
but to answer your question go for the ares. dps wise it makes more sence ,
if you go for dpp then choose the 5% crit , but @ this point it rly makes no diference @ all
increased crit hit allways needs a increased crit damage to make it worth it otherwise the result is to small to make a real diference
15%atk speed
5points crit hit
50 crit damage is the max what you´r able to get out of rings atm
lr-20 with 5% crit increase gives you 3.15 dpp and 20.8 dps
lr-20 with 14%atk speed 1.2 crit gives you 3.00 dpp and 22.6 dps
lr-20 15%atk speed 5points crit and 50 % crit damage gives 3.22 dpp and 24.5 dps
so actualy , just upgrade your weapon and ur good for a while