Not everyone's cup of tea, but I've always liked Jimmy Tarbuck (he hosted a game show called Winner Takes All.) He really made me chuckle. For the more serious quiz, then Magnus Magnusson on Mastermind.
Bruce. We have Todd Woodbridge ( ex tennis player) on Tipping Point. He is really,really good and engages very well with all the contestants and draws their families and friends into the chat.
Probably the best, but certainly the longest serving quiz show host, was Nicholas Parsons. He hosted Just a Minute on radio and then on TV for 52 years, until he died at age 96.