New or used

Earlier this year I was on a roll, laying cork and track pretty much as fast as I could. Then I hit a snag. I had been using (or re-using) Altas #4 switches from the last layout. I had a lot of success with these. I found them reliable and easy to add manual Caboose Industries ground throws which I prefer over switch machines. Then, I ran out. I calculated that I needed 11 more switches to complete the layout and 8 of those to complete the mainline with switches needed in both Irwin and McKeesport.
I pulled down the box of Peco and Shinohara (now Walthers) switches that I had. These came the layout I built in the basement of our first home. At the time, I had read these were excellent switches (and they are) and of course I was building the layout to last a lifetime. I had 2 or 3 of these on the last layout and was disappointed in their performance. Because they were not isolated frogs, they would short on my DCC layout. I read a couple of techniques to fix this but I could not get any to work. Fortunately, these switches were only on sidings so they had little impact on my operations.
The question I pondered ... for several weeks ... was whether or to use the Shinoharas or buy more Atlas. To compound the issue, I needed 3 left hand and 8 right hand switches and it seemed most suppliers only had right hand in stock. Strange but true.
I finally decided to stick with the same switch - Atlas Code 100 #4, for the reliability, consistency (the other switches are slightly larger even though they are #4 too) and DCC friendliness. Yes, it was a little expense to buy new switches when I had several leftovers but in the end, I think I will be happier.
Now I can finish the second mainline through Irwin, connect it to the mainline leading to Herminie and finish the West Yard.