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Let's just not lose sight of the fact that the SL weighs just over 30lbs, while the Vado is over 50. That definitely factors in.
I like practical terms, much more than just numbers. Bear with me if I bore you!
The Vado has a lot of power. Noticeably more power than an SL. More power than most people need, unless you live in a really hilly area, and you're just looking to ride, get places, not have a fitness e-bike. Very good for older commuters for example. Then, turbo mode on a Vado is your friend. It really is wonderful in these kinds of areas. Eco on the flats, and something between Sport and Turbo on the hills.
But someone reasonably fit willing to put some of their own watts into an SL will find on most flats and rolling hills, the SL can absolutely fly in Turbo mode. I'm nearly 60 years old, am fairly fit, and can get my SL going plenty fast, often over 20mph on flats without sweating a great deal in Turbo. If I'm really working, on the flats I can zoom along close to 25mph in Turbo. I can't imagine anyone needing much more than this! It climbs okay too, just slower than a Vado, no doubt. But most people don't ride 100% of the time in Turbo on an SL. Only if you were in a hurry. I find myself in all modes, with Turbo when I want to really glide, or on hills, that's it.