I use an Eastern Electric Avant 8 tube pre with my Snergy 450 and find
it has more "air" and bigger soundstage than my Bryston BP-6 which is a well-reviewed SS pre . Not by all that much though. If I listened to rock I would just use a SS . Modern tube gear does not sound as warm and tubey as vintage stuff which rolled off highs and lows to made the "ol
EL-34 sound .
So from this it sounds like the tube pre-amp will certainly give some of the benefits, but it's not worthwhile as just getting a single better piece of integrated equipment.