>>715936975
I use that function mostly on Railjack missions since it feels more natural to have a full helmeted Warframe when I'm invading than a Protoframe with exposed face.
The rest depends on the situation. When I'm in 1999 or fighting Grineer I usually prefer to use Protoframes. Corpus and the rest of more advanced enemies I tend to use normal Warframes.
I do exploit the Gemini emote for Excalibur once a while since Chromatic Blade changes type depending on the color so if I'm in a mixed mission this means I can change types on the fly