My mates have a silver fox and I’ve ridden one and it’s pretty solid. Can get up over 60 quite easily. Has pillion pegs for two. Had larger wheels and seems to absorb the bumps pretty well.
I have a yamaha jog and love it. Nippy little thing and I find more fun than the adly. I’m same height and weight as you too. I had a high speed pulley put in and is much faster – leaves other scooters at the lights and has top speed of around 65. Easily over 50 uphill too.
I don’t think you would get an adly gta-50 for around 1500 but good luck if you do. They have better lighting, larger wheels and seem to be really good from people I’ve spoken to with them.