Both have their advantages.....and disadvantages.
I was quite surprised to read on CN how close the Kowa came to the Borg 100 ED. Closer than one would expect. Mike Harvey in a post above mine confirms that as well.
So the performance, size, weight, ease of inserting the eyepieces and being nitrogen purged made me buy the Kowa Highalnder. I will use them for travelling and take them to darker places outside Budapest. I often stay North of lake Balaton at a very dark site between the hils. That will compensate the smaller aperture.
In the daytime I will use them for birding.
At home from the upstairs balcony I will use the APM. There it is also easier to change eyepieces, deal with humidity, deal with the size and weight. Realise the APM 100 ED is relatively light, only a kilogramm more than the Kowa but much bigger.
For most people I thnk the APM 100 ED is the best choice. You can use a huge range of eyepieces, play with magnification and exit pupil as much as you want. The edge performace with eyepieces like the Docter 12.5 is amazing. The build quality is good as well. There's the 90'and 45 degree option. Size and weight are very manageable. Setup takes minutes.
I will take a few months to compare them and make notes.
Edited by Allardk, 04 February 2016 - 04:48 AM.