I use the Toyos and am perfectly happy with them and purchase them from Demon Tweeks at a ridiculously cheap price.
Have no experience of Avons but have used Yokos, pleased with them but I found they do harden fairly quickly compared to others.

1969 4/4
1995 plus 8
1996 Plus 4 4seater
2002 Aero S1
2013 M3W
2014 Plus 8