Systems comparison

I have two systems

Both have acoustat trans nova 200 amp

both have dynavector Ruby low output mc cartridge 

1st system has arc sp 6 preamp second system has acoustat tnp preamp

first system has thoren 165 turntable 

2nd system has sme 3 arm

question is what are weak point(s) of each system

2nd question is if acoustat preamp is weak point what used arc preamp would you recommend?

also add any suggestions