I see this is your first post -- welcome to WMT!
I've done both.
@Matteo_Lahm includes an appropriate yeast in the FWK kits, so using it makes sense. OTOH, last fall I did a triple batch of Forte kits with Avante -- I purchased half a kilo before discovering I wasn't going to be able to get west coast USA grapes, and since I had the yeast, I was darned well going to use it. The RC-212 from those kits is in my fridge -- I'll use it at some point.
If you're a beginner making a first kit, follow the instructions. Matteo provides great instructions -- best in the industry IMO -- and following the instructions will produce a happy ending for you, a good wine.
The FWK instructions are a 14 day period, regardless of kit or if it has skin packs. Sealing the lid at SG 1.010 to 1.020 ensures you have sufficient CO2 to protect the wine during that remainder of that 14 day period. During that time the wine ferments to completion, under normal circumstances. When you unseal and rack, the fermentation should be complete and gross lees have dropped.
It doesn't matter if you have skin packs or not, you can leave the wine sealed for 8 weeks. In Burgundy they do EM up to 90 days. Due to continual tannin extraction, this produces a very long aging wine.
Is this what you want?
Consider what
your needs are, and ignore everything else.