My favourite YouTubers change all the time, I tend to find one or two I love and then binge watch all their videos!
Recently I've started watching Amy Ordman (her videos are really short and snappy but enjoyable to watch) as well as Noodlerella, Melanie Murphy and Channon Rose. Current favourites are SacconeJolys, The Gabbie Show, Rose and Rosie and David Dobvrik. Then people like Jenna Marbles are Grace Helbig are the channels I've watched for years and often go back to re-watch some of their best videos.