Best get onto VM and ask for a better upload to get more data from peers as opposed to having to rely on seeds
Ask yourself if the speed difference and price difference make that much difference to you, and if you're going to lose a bundle discount.
Also hugely don't forget the big reduction in the STM thresholds. If you're a torrenter you may find that downgrading to 10Mbit leaves you stuck at 2.5Mbit quite a bit due to breaking the much smaller limit.