I have not used Menzerna or Adams polishes myself. They both seem to get good reviews.
In regards to M105 and M205. M105 has a learning curve to it. As you said it has a short working time and it dusts like crazy. I don't own M105 anymore. I have switched over to M101 which is much better. Still dusts but not like M105. As a matter of fact I have been primarily using their D300 compound. It was intended for their microfiber cutting pads which I do own. But D300 works really well with foam pads especially with the new thin Meguiar's foam pads. Very low dusting and a long working time.
In regards to M205 what was your technique? What machine? What speed? I find it to have a long working time. The working time for a compound and polish varies by environment (temp, humidity). The only thing I don't like about M205 is that it leaves a lot of oils behind on the surface. So it takes quite a few wipedowns to remove them prior to applying a sealant or coating.
HD Polish is a good one. Does it's work fast and leaves nothing behind.
Americana Car Care has their Ameridepth polish which is really good as well. They are in the process of revamping their compound and polish and I am looking forward to trying out at least the polish. Very underrated product line.
