Hi Felix
I too get where you are coming from. All our experiences differ and I started with these awful (for me) one sizers. I am slim only an A cup but was driven to bras by sore nipples and being called out by my wife for instinctively holding my chest when running for a bus, going down stairs, negotiating stiles when hiking. I firmly believe that If folk have got to the point of asking about bras, they almost certainly need one.
Took male doctors advice to turn to a bra. He warned me that the only styles that would help would likely be those that would I would probably ideally avoid as immobilisation and support would only be achieved with bras that would give more shape abd less concealment. Took nearly two years of misery and encouragement from a long suffering wife for me to admit he was right!
I was fortunate in that my wife offered a bra that turned out to fit well and eventually accompanied me to a proper fitting where the size was confirmed. I have since stuck with the same brand and size. As regards style, those that make my boobs more obvious are, as the doctor said, the most comfortable and draw far less attention than supporting our chest manually which certainly helps none if us to be discrete.
We will disagree about advice to newbies, whilst recognising our mutual desire to help.
Cheers mate