Kegging, add sugar or not?

[K&H brews]

So I have done much "Googling" with mixed results. When I keg should I or should I not add priming sugars? I have made an excellent lager and did not add sugar. I now have a Koelsch in the keg and have been wondering if I should have added sugar or not. What are the pros/cons?

 

[Kevin58]

Adding sugar to the keg is usually done in the absence of using CO2 for carbonation. If you have a CO2 tank and regulator and use that to carbonate you won't need to add sugar. If you don't have a CO2 system hooked up then you will need to add priming sugar or your Koelsch is going to stay pretty flat.

 

[K&H brews]

Adding sugar to the keg is usually done in the absence of using CO2 for carbonation. If you have a CO2 tank and regulator and use that to carbonate you won't need to add sugar. If you don't have a CO2 system hooked up then you will need to add priming sugar or your Koelsch is going to stay pretty flat.

That is what I had been thinking also.
However, I also do some keg-to-bottle with a The Last Straw bottle filler, works great by the way, will my beer once bottled stay carbonated throughout it's storage?

 

[Kevin58]

I use the Tapcooler counter pressure bottle filler to fill from my keezer. I bottled a bunch for a family reunion last June and had a couple left over that I stashed away... six months later I discovered a local competition and submitted two of those bottles. It scored 41 total points which is considered excellent by BJCP standards. So yes, if bottled properly they should stay carbonated.