Would you rather have an upper chamber staffed by people who know things or one staffed by those who believe?

I'm referring to the British House of Lords but perhaps the same could be asked about the US Senate. There is a push here for a totally elected upper chamber as opposed to the present eclectic mix. I think we could end up with a bunch of duds who aren't smart enough to govern directly. Think John Prescott and Neil Kinnock and I'm sure there are members of the other main parties who could fall into that category. I think the chamber requires more people of independent mind than less. Agree or disagree? Please give reasons. Thanks.