Logitech k480. I carry it everywhere. Has a three way switch, iPhone, iPad and Mac. Only problem is it interferes with headphones/wifi somehow. Mac cries piteously when the k480 connects.
I also like my K480, and got a couple for friends as well. One failed suddenly, and on opening the flat-flex had just come out of its socket. I like the sturdy rubberized channel for putting phones and tablets in. They hold in securely enough to carry it around the house and not have the tablet falling out.
I’ve had both - the 380 is much lighter to carry around than the 480.
I wouldn't recommend either though, for both, the keys are not nice to type on if you don’t press perfectly downward, if you have any angle other than vertical, the keys occasionally bind a little. This is amplified on the 480 with longer key travel. They’re different types of key mechanisms on both but suffer the same problem.
If you have any kind of case, the 480 stand slot can be harder to use.