Unit Size

Gamers in my area have been playing pike and shotte for a while using 8 man shotte units and 16 man pike units both using a 4 man fronts or 80mm. I’m new to the game and am building the French 1690 army from the rulebook. To try to match their units but still look like a reasonable later period regiment, I’m wanting to use a 12 man unit with a 6 man front or 120mm. Some are saying a standard size unit is 8 men. Others say it doesn’t matter. My reading of the rulebook says it doesn’t matter. What’s the general consensus for unit sizes matching your opponents? I’m including a picture showing an 8 man and a 12 man unit. I could play 8, but 12 looks better. 20 would look even better, but they’d be way bigger than anyone else locally.