Manaslu Circuit vs Annapurna Base Camp trek - Early March

Hi, I am deciding between the Manaslu Trek and the Annapurna Base camp trek and would love some advice or info if you have done either (or both).

I am a 27 solo female traveler and looking for something with beautiful views and varied nature as well as culturally rich. I would love to see the high mountains up close and have heard the Annapurna Trails have very dramatic views although the Manaslu trail is also said to be beautiful.

I am alone therefore would be happy to meet people along the trail but do not want to be walking with crowds. (I have read that the Annapurna trails have become very busy while there are relatively few people on the Manaslu trail?)

I am going early March, it will also be my first high-altitude trek in cold conditions. I am fairly fit although I am heavily asthmatic and would need to consider this when at high altitude. Is the remoteness of the Manaslu trail a problem should something go wrong ?

If anyone can share their experiences I'd be grateful for the input.

Edit: For other asthmatics, I've been told by two doctors that whether the altitude will flare your asthma or not is completely dependent on your body. Therefore, to just bring your medication with you and look after your lungs leading up to the hike but asthma shouldn't be a limiting factor. I assume you will also feel if its causing you trouble on the way up and not just suddenly have a massive attack at the highest point 😅