I think for podcast recording in various untreated environments you’d be best with a dynamic microphone. A good condenser microphone will always sound better than a good dynamic microphone in that it will produce a richer, warmer sound but the trade off is it needs a sound treated space to record otherwise your recording will be tainted by unwanted room reflections.
Obviously if you’re recording in the world’s worst acoustic space then the dynamic microphone will pick up on the room reflections too but in an average room you’re more likely to be able to successfully record with a dynamic microphone.
If you’re recording voiceover for radio imaging, audio narration etc in a sound treated space then use the TLM 103. If you’re recording podcast in untreated rooms use
the SM7B. If your budget stretches and you have sound treated environments to record from then you could record the podcast using the TLM 103. There’s no hard and fast rule saying you have to record a podcast on a dynamic microphone.
Alternatively you could look at other dynamic microphones too. Heil Sound is often a podcaster’s favourite.
Your only other option if you have the TLM103 is to make a make shift booth. Maybe you could get enough sound treatment by using items in the rooms you’re recording in like sofa cushions, curtains, duvets but it wouldn’t be perfect. There’s also options such as the Kaotica Eyeball but while this would lessen reflections coming from the sides it obviously is open at the front to allow the original voice in so any reflections coming from the back of the room and bouncing back would still end up in the microphone. You’d have to have a least sound treatment behind you to trap the reflections that make it past the Eyeball and back to the back wall where they’d find their way back into the mic.
In short if you don’t have sound treatment either the SM7B or another dynamic microphone could well be your best option.