I'm not willing to spend much time processing. If the background is fairly straight or smooth, I'll stack, using Sequator, which is free, easy and fast. Stacking definitely gives the best results over all. But, Sequator doesn't do well at all with complicated backgrounds (like trees). So, with complicated backgrounds, I just use a single exposure and use Nik Dfine, which is also free, easy and fast, to reduce noise on a single exposure.
There are examples of both posted above. Pretty easy to guess which is which, just by the backgrounds.
Might be worth adding... I never man the camera for these night shots. I use an el-cheapo intervalometer ($20) and let the camera snap away while I'm asleep . That's why you can see me slumbering peacefully in my cot in some of the shots .