Personally I'd go with Dai (51 Wales caps, 3 Lions tours) rather than Jones (no international caps).
However Jones has done a lot of coaching - really a lot of coaching, with just about everyone!
1994 Randwick (Assistant Coach)
1995–1996 Tokai University (Assistant Coach)
1996 Japan (Assistant Coach)
1997 Suntory Sungoliath (Assistant Coach)
1998–2001 Brumbies (Head Coach)
2001–2005 Australia (Head Coach)
2006 Saracens (Technical Advisor)
2007 Reds (Head Coach)
2007 South Africa (Technical Advisor)
2007–2009 Saracens (Technical Advisor)
2009–2012 Suntory Sungoliath (Head Coach)
2012–2015 Japan (Head Coach)
2015– England (Head Coach)