After posting, I listened to the sample of the first track on HDTracks. Bass was definitely much more present. While trying to volume match the iPhone to the laptop, I realised the bass became better. I am merely listening too softly. Once the volume increases the upright bass fills out much more.
Initial thoughts make me think that the HDTracks version sounds much more real. For instance, it is almost as if I can hear the wood vibrate on the upright bass. However, I will need to have to listen to both with them being volume-matched.
Hope my initial impressions get proven wrong though...paying 9.99€ for an album is a lot better than $24.99...