Green polytunnel or greenhouse?
I want to grow tomatoes and aubergines etc in a polytunnel. For now, I don't want to invest too much, I'd rather get something small and mobile that I can try methods and move around the garden until I have my finished layout and better understanding (I'm just starting out this year so might re-arrange beds etc next year once I have a better understanding of how to grow, how much space I need for stuff, etc). So I'm thinking of a cheap polytunnel like this one - https://www.amazon.co.uk/Palm-Springs-2m-Polytunnel-Greenhouse/dp/B00COEG784/ref=sr_1_1?ie=UTF8&qid=1476227887&sr=8-1&keywords=polytunnel
The above polytunnel (and most cheap ones I see) are green though, would this affect growing? We don't get the most sunlight up here in Scotland so a little worried about that.
Other options might be a greenhouse, like this one? https://www.amazon.co.uk/dp/B019RPN02I?th=1 A bit more expensive but seems somewhat mobile, and clear
Not sure if there are cheaper methods for just starting out, I saw some really flimsy models that might be OK for starting? Eg. https://www.amazon.co.uk/VonHaus-Compact-Greenhouse-Shelves--Warranty/dp/B01D4RPXY8
Would appreciate any advice on this matter, thanks