Always hard to say with these things via the internet, however I would say you could ride either one based on the info you provided. Difference might be a shorter stem on the large and possibly fewer spacers. I am 5’10 and have most of the length in my torso vs legs and I prefer the M/L size due to the lower stack height of the frame. I ride a defy advanced with a -17 stem at 110mm with 10mm of spacers. So a low position. Large would be too high for me in most cases. The other thing to consider is the difference in stand over height of the frames, you posted that you rode it so you should know your answer but if it just brushes the boys then it may not be the most comfortable. I also ride a tcr advanced sl and use m/l in that as well. Finally if you understand stack and reach and can get the measurements from your existing frame, stem and bar reach you can use this calculator to duplicate your position www.velogicfit.com. Use products drop down to frame comparison tool.