I'd go with the latter based on what you've shared.
This is just my subjective opinion, but the Marantz CD player should outperform your other options. It has a very good analog sounding Cirrus Logic DAC in it and will accomplish what you want in one box. If it doesn't thrill you, you can always explore standalone DACs. But you'll have to venture higher than 150-200 euros to find something that sounds better than what's in the Marantz. Comparing DACs can be a time consuming, expensive and frustrating process.
Yes, you may like it better. You have both correct? Would be silly not to try.
A DAC and integrated amp for less than a CDP with possibly the same DAC (& supporting circuitry)?
Yes, the PM6006 has the same Cirrus Logic CS4398 DAC as the CD6006 and might be worth trying with your Blu-ray player. But keep in mind that the PM6006 is a relatively low power integrated amp at 45wpc into 8 ohms and 60wpc into 4 ohms. You'll want to make sure that's enough to competently drive your speakers at the levels you want. If your speakers are very efficient, you'll be fine. I still think that the CD6006 will provide better results with CDs because that's what it was designed to do. While the Sony is capable of playing CDs, its main design function is playing and processing Blu-ray discs with an emphasis on video.
My current set-up is HDMI 1 "Audio/Video" going to the TV, and HDMI 2 "Audio" to the soundbar & subwoofer (I never watch TV hence it works, and I don't need to use TV-ARC with such a set-up).
