Gordon.
i heard your scraft u has studer preamps ? is this right.? but ive heard they are a bit noisy ?
The Ui24R is off-topic as it's a 24-channel mixer, not a sound card.
One of Mike's (sorry, forgotten surname for the moment) observations about sound cards was the lack of gain range for use with low sensitivity mics, and indeed yours also. I note that the 4g 2i2 claims 69dB, my Ui24R claims 64 and the H224 claims 60. That
suggests that the 2i2 may be notably better than either of the other two. Whether that's real or specsmanship I'm uncertain.