Supmaori, if you are still curious about comparisons, I went out today and tested my 8'10 Speeed (130 L)which I have had for almost a year against my new 8'7" Flow (121 L)which I have had for about 10 days. Its the first day that I have surfed them side by side in the same conditions. Surf was waist to occasional overhead, with cross onshore wind at about 8-10mph and three directions of nasty cross rollers from shifting high winds on the outside. Me; 65 years old, 75 kilos, surfed for 40 years and SUPed for one year.
Though I like both boards a lot, there are some very noticeable differences in these conditions, more so than in perfect glass.
1. The Flow has more initial twitchiness in terms of balance, but I can stay dry on the Flow when the Speeed is tossing me in the drink. When the Flow tips, even way over on the rail, it is fairly easy to brace and right it. In conditions like today, the Flow has me twitching and bracing all the time, but almost never dumps me. The Speeed is slightly less twitchy, but when a cross roller sucks a rail down, I often cannot save it. It is like the rail evolving into a domed deck acts as a perfect wing, and once the cross roller flows over it, that wing is going to keep diving to the bottom no matter how hard I try to brace against it. To me, it literally feels like an unstoppable force. The rails on the Flow go up to a flat deck, and when the cross roller hits that transition onto the flat deck, the board wants to right itself with just a little help. The difference for me is huge anytime there are cross rollers in the lineup. In glassy conditions, I might say that the Speeed is the same or slightly more stable than the Flow; but if there is any chop or cross rollers, the Speeed is hopeless for me, while I can stay upright on the Flow; its all about how the rails evolve up into the deck profile.
2. The Speeed is a delight to paddle in smooth water, with the wide concave nose providing lots of lift to get the board up and going. However, if you are trying to paddle against the wind, even just to hold your place in the lineup, that big wide nose becomes a problem. Just like a boat with a flat broad bow, the nose slams into every piece of wind chop so that you can feel the whole board shudder. While the Flow does not paddle as fast as the Speeed in glassy water, the pointed nose pierces wind chop like its not even there, making for a very smooth paddle into the wind. Once again, the difference in glassy conditions is minimal, while the difference in choppy conditions is huge.
3. I like the way both boards surf very much, but they are totally different for me. Compared to other reviews, mine may be somewhat different because of the length of the boards I ride. My 8'10" Speeed reminds me of all the great qualities of a long board. Nice pivot or carved turns off the tail (and like any longboard you do see and feel some swing weight from the wide nose), fast effortless trimming down the line from the straighter outline and flatter rocker combined with the refined rails, begs you to walk up and down the board (the board gets bored if you just stand in one place), easy to trim and balance from the wide nose; all good stuff. The Flow is designed off of a shortboard template, and even at 8'7", it looks and surfs like one. Along with the much curvier outline, it also has a lot more bottom rocker end to end. With all those curves, the Flow wants you to constantly be working the rails, either rail to rail cutbacks, or pumping down the line. It is not particularly interested in you just standing there and trimming down the line, and it will feel slow if you do. Keep working those rails and pumping those thruster fins, and the board will generate more speed than the Speeed, but you have to work for it (and be on a wave that allows you to do that). Yes, at 8'7" you can walk forward on it a little, but the narrow nose will quickly bog down if you get too far forward on it. This is not the board for someone who likes to cross step a lot or spend any time on the nose. It is the perfect board for someone who wants a SUP with a short board feel, and reasonably good stability.
Of course the look and construction of the Sunovas are awesome, so both boards are winners on that count.
Hope this helps.