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Not sure how big your backyard is - of the two, I'd pick a 20-60x over a 27-60x, to have a little less magnification on the low end. You might want to consider a binocular - 8x is about the limit most people can use handheld - not only is the image magnified, but also the natural tremble in your hands - even your heartbeat.
Above that magnification - 10x and above, you might consider a binocular that can be tripod mounted binocular, it makes extended viewing more comfortable.
Whatever you select, remember that you have 30 days from delivery to evaluate the product (please return the original packaging), if you find that you have too much magnification, or too little, we're happy to swap it out until you find a suitable product, or refund your money.
Mark H.
No, this the top of the line Razor but was discontinued in 2018.