Welcome back to RC. Both of these sims will allow you to hone yours skills in all areas of learning rc again.

I have both Realflight and Phoenix and both are top notch sims, They both have their strong points and weakness, Phoenix- You can use as the previous poster said the DX5 on a real world model if you buy a 2.4 receiver, Top notch heli physics, above average plane physics. Super camera perspective as the ground pilot. Runs well on a average configed computer. Graphic setting can be adjusted to hardware. Only has photofield scenery but seems above average with the camera positions offered. They have a lot of planes and helis to offer but only what they release, no user content. Average physics editing to tweak existing planes or helis
Realflight. I only have 5.5 so I can't say what 6 has to offer, But RF has the interlink usb controller that can be tethered to real radio, Has above average plane and heli physics, total control of editing physics, Photofield and 3d fields, top notch graphics with normal maps but can bog down a average computers fps to a unrealistic state, but options can be lowered or turned off. Lots of planes and helis offered and a user content database that has just about any plane or heli, color scheme, physics edit, you could want, They might not all fly like their real world conterparts but can be edited to taste.