The new Apple TV 4K goes on sale Friday and it should be a big seller. Apple has dramatically cut the price by $70 on all models while doubling the storage and adding features, making it the best Apple TV value ever. But for the most part, the new Apple TV is still largely unchanged from the previous model. Over at The Verge, Chris Welch praises the new A15 chip as “more snappy and responsive than ever before” but also admits that “the only area where I’ve noticed the extra speed this time is when pulling up the multitasking view.” He also notes that apps are faster to load, but “you’d be hard…