Welcome!! You found an awesome place to hang out and ask questions like this. . . . Hopefully you will like it here.
I would always recommend using Chevron Delo ELC as I think it is great. I will admit that I haven't checked out the Evans yet and from their site it would seem like it is the best. What ever you go with, you just have to make sure you get all the old coolant cleaned out so you are not mixing them. There are some combinations that don't 'mix' very well at all. In fact, sometimes mixing them can cause you a lot of problems.
I can back up my claim on how good Delo ELC is! I should do a write up on it actually. But, from what I learned in college, it is the best out of the major name brands out there. Here are a few quick things I can remember:
You don't want the 'green' stuff. It has a life of 18 to 24 months from the date it was made. I didn't know this; I used to buy on a good sale because I would eventually need it. It works by coating the inside of your system to prevent corrosion. If something breaks through this coating then you will have corrosion in that spot. This coating actually inhibits heat transfer as well. Once this coolant reaches the end of it's life, the coating grows faster and thicker. This further inhibits heat transfer. Not exactly what you ordered for your cooling system!
Don't go by color! There are different formulas out there that have the same or very similar colors. Take for instance the orange Dex Cool that Gm uses. Guess what color that Dodge uses! Same color but different formulation!! (Gm uses an OAT while Dodge has an HOAT which is much better) Then there is Ford. . . . They use both an OAT and a HOAT but they help you out by making sure that the color is the same for both
There is a lot to know about coolants! I'm sorry I can't write the multi page report on them that you need right now. What I would recommend is this: Put the Chevron Delo ELC at the top of your list! If you can find out if Evans can beat it then you have yourself a winner. I would also compare price. The Delo ELC is either $12 / gal. or $17 for concentrate (I have to do some checking into that. I paid $17 / gal. for the last 6 I bought on my wholesale account. Then I am told that it should of been $12 / gal.!! I hope they did make a mistake like that!!) Reason I am telling you the price is that the Delo ELC is good for 8 years of use. That makes it way cheaper than the 'green' stuff even if it is $17!! Now if the Evans really can be permanent then maybe it is ok it costs that much. I would like to see what the cooling system looks like after 20 or more years from using the Evans. The thought of never changing it kind of