I would pick "flooded." It doesn't matter much whether you pick 14.6 or 14.7
What matters is how long it stays at 14.6 or 14.7 after it gets the batts there. You want it to stay that high till they are charged up, then drop to "float" at 13.6ish.
If you get to 14.6ish real early in the day, you might want to drop to float before dark if you start losing water from staying at 14.6ish too long each day.
If the charging profile is to drop to float after two hours of absorption that might be too soon. You can fiddle with all this by setting your float voltage to be the same as absorption voltage and then let darkness happen to be your float time.
It varies for all that by just how much daytime is left once you get them to 14.6ish, and that varies all year by latitude and time of year.
So it is best to have adjustable everything and keep an eye on things and adjust as required. Solar is NOT a "set and forget" kind of situation.
