Assuming the OP is stepping up from a soft cover, the money difference may be a shock, but, I personally believe it is completely worth the investment.
That cover from weathertech is almost identical to the Lomax, but the Lomax offers 3 different surface finishes - certainly worth comparing with the Weathertech - especially looking at the warranties side by side. I have heard/read great things about the customer service from Lomax.
My last truck had an Extang Solid Fold, Tri fold cover, and I was fairly happy with its fit and function, but I also got it at a ridiculous bargain at $400 delivered.....when I got my Ram, I wanted something different. I currently have a Ranch brand solid fiberglass tonneau, and it fits my use perfectly, but I strongly considered the tri fold style, focusing on the Lomax and the A.R.E. Fusion.
So, as others have offered, you really need to consider how you are going to use your truck and what cover fits your needs best.
In my humble opinion- the best all around tonneau cover is the solid tri fold design cover - security, fit, protection from the elements, ease of removal and installation, and overall looks. If I were buying a new cover, I would be looking at the Weathertech, the Lomax, & the A.R.E. Fusion - all low profile, solid and well constructed, and reportedly weather tight. Yes they are an investment, but, I believe it is a worthy investment.
good luck - happy shopping.
https://www.agricover.com/lomax/res...00&choose_bed=5ft+7in+Bed+(w/o+RamBox+System)
https://realtruck.com/p/a-r-e-fusion-tonneau-cover/v/ram/truck-1500/2018/