My 1st intro to the e-bike world was an iZip E3 Peak 4+ years ago.
LOVED IT!
However, not being a 'mainstream' manufacturer, support was difficult and as items that needed attention began, I found it very difficult to find any LBS to assist.
I then chose to go to Trek.
Trek is 100% phenomenal!
HOWEVER, it is highly dependent upon the level of professionalism, experience and capability of your local bike shop. Without it, you are screwed unless you own the responsibility of all things except the proprietary Bosch components or are assured that the LBS has capable, competent and reliable employees.
Given I had difficulty to find responsible Trek shops to meet my expectations, I went to Specialized.
Out the gate, I can say I had some issues with local bike shops assisting me to buy a new Specialized bike. All they wanted to do was sell me what they had in stock, and after I did my homework and found what I wanted, it was suggested that maybe I just ask the LBS to order me what it was that I wanted. None ever even ever offered!! I did suggest they order me what I wanted, I got it, I love it, and all I hope is that moving forward that I can rely upon my LBS where the purchase was made and that the manufacturer (Specialized) stands behind their product if needed.
MY experience is: (from real life experience), I am SUPER HAPPY with my Vado 5.0.
Good luck in your decision process.