I have owned both, and currently have a G19 instead of a P226.
As for the night sights on both. I can't stand the factory sights on either. Both of them I had vertical grouping issues and replaced the dot the i type setup on the 226 with some 3 dot trijicions which were fantastic and my G19 came with night sights, but I have shot a G17 with factory sights and I was not to impressed.
I'd say get both eventually. The G19 is the ONLY glock that interests me, and probably the only one I will ever own unless I get one for free which is why I have one now and now a P226. The P226 was a great gun, fits my hand like a glove, accurate, easy to take down. That being said I might look at a P220 Combat or something in 45 from the SIG line up of things.
I have a 2nd Gen G19 that I put a hogue slip on grip onto which made the grip fill my hand up a bit, but I would take it off and go back to the plain slim grip.
Both are great, try them both if you can get what you want.
The 226's trigger is much better than my Glock but the 19 is growing on me. Gonna see how many rounds I can shoot until I get a malfunction without cleaning it.
Both are about the same price now. Questar has both the G19's and 226 around the 850 mark with you finding one of each alittle cheaper used in the EE.