GBBRs are definitely more immersive and feel cooler to use.
They are also more challenging and expensive to use on game days.
They are NOT more accurate or have longer range.
I saw a video (cant remember name) of a US player who found the best compromise for ammo was to take 4 or 5 mags and refill them with BBs and gas in the field.
As Hudson said above, start by using heavier BBs and only use single shot.
Only consider changing to GBBR when you're getting bored and need more of a challenge 😉