Both have pro's and con's. You usually know who yours friends have screwed, this makes bareback less risky. You usually know your friends personality. Unfortunately some times friends are less discreet than they make out to be. One of our so called friends did the ive fucked his wife while he watched but dont say anything. Rumours obviously spread between one of our smaller groups of friends. One of these decided my wife was a slut and groped her a few times. This ruined the whole experience. On a plus though another couple in this group became very interested in nights at ours. We played with them for over a year.
Strangers come then cum. Bareback is scary but they don't know anyone you know. As long as you don't live near them its a win. You have to get to know strangers on line before you meet but online people can be different. We had some great experiences with some but two really bad ones with a couple of men. Both said its all about the lady. One turned up, rammed all holes, came twice fortunately in condoms. Dumped the condoms on our bathroom floor then left with out a word.
The other turned up, was very attentive she came, then he came he left quickly before we realised he'd removed the condom before cumming. Not a lot of things are worse than going to a gum clinic and explaining to a very judgemental person why a stranger came up you infront of your husband.
Friends are definitely best but choose wisely.