Gardner, what a lovely post. You have really captured the essence of both songs in just a few words (although you did go a bit Julie Goolden on us with your description of all of the musical flavours that you can pick up on ROR).
I Thought is like bumping into an old friend after many years. A bit different than you remember, slightly mellowed, but instantly familiar and comfortable. (Jerry Nunn, I know that you will be laughing at that description given our recent experience - but you get my drift?). To me, it is the classic early Eno template brought up to date a little. The problem is that the delivery is strongly stylised, which is great if (like all of us, presumably) you like the style, otherwise the great little song that lies at the core of this recording can get missed.
However, Gardner asks which out of the 2 songs we find the most satisfying. For me, the answer has to be Reason or Rhyme. I can't improve upon Gardner's description above. Suffice it to say that this is one of BF's finest compositions and is full of the classic song-writing ingredients. It is just waiting for somebody with more selling power than Bryan has nowadays to pick up on it and deliver it to the wider market. Of course, the lyrics might pose a problem for the younger artist, and it won't be delivered with anything like the poignancy and style that Bryan brings to the table - but it is such a great song that details like that shouldn't hold it back too much.
Interestingly, as an aside, ROR has come up on the outside rail a bit. While it now generally gets acknowledged as the standout track on Olympia, if we go back to related postings in this forum from a year or so back, Song to the Siren was getting most of the praise.