The body isn't terribly important. Some brand aren't the most upgradable, they have some fitment issues or proprietary parts.
Doesn't matter if it's a plastic or metal gun, what it performs like stock, etc.
All that REALLY matter is that it's compatible with upgrade parts. Any aspect of it's performance can be modified and upgraded.
You're going to lightly upgrade this gun, then eventually want something better later on regardless.
You'll end up having a $60 smart charger anyway, those wall chargers are junk.
G&G tends to be the preferred starter gun, excellent balance of stock performance, upgradability, decent body, and value.
And honestly, once you upgrade them, there's no performance difference between a $200 plastic G&G and a $600 metal VFC. The VFC is just a tougher bodied gun.