The simple answer is that I prefer the CT110. I have had both the CDI and points version of the CT110 and am not sure that when well tuned that there is much difference. Maybe a little more reliable over a longer period of time. I don't think there is a very noticable preformance variation between the 90 and 110. I can't put my finger on it but I just like the feel of the 110 a little better. They are also a little newer technology which is almost always a plus. Parts are often easier to get. If I had a choice I'd go with the 1981 or later CT110 over a CT90 but then I wouldn't turn down a CT90 it good condition either.

Doug - Olympia - Washington
 I don't know how many CTs I have.