Classè Six vs ARC LS7

I now own an ARC LS7 (tubes are Siemens NOS) and an Electrocompaniet ECP-1 pre-phono (with a Lyra Delos MC cartridge).

Do you think a Classè Six (NOT DR6) would be an upgrade, a downgrade ora a "sidegrade" ?
I'm interested to comments about both line stage and phono section.
Thanks, ciao
daniele