Thanks for the replies. Showing my lack of knowledge on trills looking at the picture from earlofmar it looks like the trill notes in right hand are a one for one match with the notes on the left hand. Is that correct? The same appears to be true for AZPiano's post. I was playing E-F# for every sixteenth note in the left hand. Is that too many notes?
Thanks again for the help.
If you play 16th, that would not be a trill anymore. So yes you have to play 32nds. The note on which you start depends on the context. In classic (18th century) music you can have both ways. Often times you use the upper note assuming it is the dissonant one or the main note if the upper one is consonant. There is also the issue of melodic flow, when going down by steps you usually want to avoid starting on the same note as previously though there are numerous exceptions, in Bach and elsewhere.
In this case my personal preference would be to start on E essentially because of 2 reasons: 1-the left hand plays a drone on A, so F sharp is a minor sixth (half) consonant; E is a perfect fifth so as we are playing the Dominant in preparation to the next bar landing on the tonic it is more important to start the beat with the fifth rather than with the minor consonant sixth. 2-Starting on F sharp would indeed break somehow the melodic line and it is fairly audible because the right hand stays on that F sharp during an 8th and the left hand stays on A as well. So starting again on A and F sharp is a bit too much and again produces an effect that is contrary to the harmonic situation. The situation would have been different if the left hand had played another note than A.
The drawback is that since you have a termination on D-E, you have to play 3 notes on the previous note: E-F sharp-E to finish on E and then play the termination D-E thus fianlizing the trill on the perfect fifth, dominant followed by the tonic triad on next bar.
That said given the speed at which you (should) play it, it does not make a breaking difference. So it is more of a discussion for purists (which I admit I am more often than necessary).