Obviously out of the 2 it would be No 1. But personally I would not be putting on any slippers 'provided for me,' I would just walk about in my socks. No way am I wearing someone else's manky slippers that many other people have worn.
I always find people asking you to remove your shoes quite hilarious, because the of the 4 people I know who insist on it, 2 of them have really manky, dirty, grotty houses. The carpets are filthy. After the first 2 times of going, my feet and socks felt so grubby that I refused to go again. Each time I got home, I had to wash my socks and have a shower, as their house was so grubby.
I think some people think it makes them middle class if they insist people remove their shoes. It doesn't. And it's a bit weird to ask people to remove their shoes when your house is a filthy shit-tip anyway.
I rarely ask people to remove their shoes, and will only ask them if it's extremely wet and their shoes are muddy. Most of the time they have only come in from the car, 10 feet away from our front door, and the vast majority of people don't have dirty, muddy shoes,covered in dog shit! As some of the histrionic posts on here are suggesting!
I like people to be comfortable in my house, and not feel that the first thing I am going to do when they turn up at my house, is jump on them and demand they take their shoes off! I am sure the 'remove your shoes' brigade will insist they don't do that. I can assure you that your guests will feel like that way though.
Sorry but insisting everyone removes their shoes (when they are not even dirty) and forcing them to wear slippers is a bit weird, and frankly rude and unwelcoming. Whenever anyone asks me to remove my shoes, (when it isn't even wet or muddy and my shoes are clean,) I think (just for a second or two,) 'you're a bit of an obnoxious, precious twat aren't you?'
And it puts me off going to their house again.