Yes, with the 11" one would expect the FOV to be smaller.
The focal length will be longer but that could be a significant benefit when using the ASI294 because you will have less under-sampling.
The 11" will be considerably heavier and longer and that means you need a more robust mount than you would need with the 8" RASA.
Cool-down will be slower with the 11".
I think there are lots of reasons to like the 11" over the 8", but I think that if I had the budget to buy one or the other I'd probably stick with the 8".
The 8" has an image circle more appropriate for an APS-C or 4/3rds sensor. Cool-down is faster. I have an ASI183 so I don't have to be under-sampled all that badly even with the shorter focal length. As I get older I appreciate smaller/lighter equipment more. I don't have to use a heavier mount with the 8" RASA.
I do have a bigger mount so I could actually mount the 11" fairly nicely on that, but if I want to travel? The lighter mount and OTA are much easier to deal with and part of what I'd want the RASA for would be for public outreach.
If I were planning to just leave the OTA on a big mount in the observatory and if I had a full-frame camera - I'd be in the slam-dunk category for the 11" RASA.