Do you already have these amps in house? You say you have them so assuming you do just try both and see which sounds better.
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Bryston is always a good choice and those 7B3 monoblocks at 7500 with many years of warranty worth considering. On the face of it I would opt for the 350 watts into 4 ohms I think 70 watts will be light but kind of depends on your taste? They do work with tube pretty well so hard to say. Now, I will say for sure that the LRS I am using work better with Bryston 4BSST than the monoblocks I was using at 1/2 the power. These speakers love power. Also the bass with the Bryston is better now than the monoblocks with no subs. I do have REL T5x2 that work very well with the LRS and really want monoblocks to work the best in terms of hook up. But, the Bryston now is OK on bass and the subs get a little funky on the integration. Best wishes.