My standard favorite is on top, but with her ass elevated by lying on top of a pillow, and her legs up on my shoulders. This tends to result in good control and flexibility with regards to the angle of penetration and things one can do in the process.
Comedian Ron White calls this position the “lazy dog”, it is nice for a morning: you’re lying on your side behind her, and are essentially doing doggie style but lying down. It’s a nice lazy way to start off a morning
One position I don’t see talked about enough is her lying on her stomach and then entering from behind. This is a nice angle, your bodies can be touching completely and you can smell her hair, which can be nicely intoxicating
Standing up or sitting down are certainly not as good in terms of actual sensations, with maybe standing behind her with her bent over being an exception that can be pretty good.
The more she arches her back, the deeper the penetration with doggie style.
If you’re lying down, and she’s riding you, you can give her a break sometimes by just holding her hips to be in place above you and thrusting from below.