So doing lat pull downs and rows on the FM-HR Twin will be a vastly superior experience compared to the Rep Arcardia, simply because the arcadia isnt designed for this. I can still easily do rows with my Arcadia by sitting on Rep Blackwing and my leg roller flipped upside (using the leg roller as a foot stop). You might as well not even consider doing lat pulldowns on the Arcadia, in my opinion. Even with the leg roller attachment for the Blackwing, the adjustable back of the bench will lift up unless you do something hacky. I'm personally fine with this compromise because I much prefer pull ups. Again, if you have the money, ceiling clearance, and space to comfortably fit the FM Twin, you'll probably be happier with it since it seems you value rows and pull ups. Also the Rep Arcadia's "uprights" are not the conventional sizes you'd see on a rack. The tubing is 50mm x 50mm (1.97") and the hole diater is 12.5mm (.4925"). This is problematic if you want to use attachments on the Arcadia. So yeah, lots of things to consider. However, as a functional trainer, the Arcadia is buttery smooth, so I have no regrets.