I can't speak for Badger, I haven't liked the ones I've held comfort and balance wise, so have never used one. However I am a massive fan of the HP-CS. It is a fab brush, and though not the cheapest, it's not that expensive compared to some either. And for it's hardiness/build quality and versatility it's hard to beat IMO. It is capable of really fine detail, but can also cover larger areas (relatively speaking) and anything in between. So while it is a bit more money, the long lasting hard wearing parts, and the variety of what it can be used for make that extra money suddenly make sense in the long run. It was my only brush for 3 years, and did everything I asked of it, from tiny murals to leather jackets, to automotive. I now have a micron for really , really fine work, but still use the HP-CS as well. It's .35 nozzle is a bit more forgiving of paint ratios than a dedicated detail brush, and the self centering nozzle and one piece trigger assembly make cleaning and maintaining a breeze - less fiddly parts to deal with. It's ideal to learn on, but not something you will outgrow. There is also a .5 needle and nozzle, if you wanted to get it and swap it out as needed.
Badger users around here seem to favour the Krome, I am not sure about the 155. I know that they have good customer service and loyal customers. I'm just an Iwata chick, but I'm sure the badger guys will give you the reasons they love them.