Emulating ADSL bandwidth shaping

Is cable better for gamming?

Depends on the game and the gamer. Personally, it doesn't matter to me, as
even if I was on my employer's 10GE uplink, I'd still lose to some snot-nosed
brat with fast reflexes on a 56kb modem. So till they invent an uplink that
has -1500ms latency, I'm screwed.

All the LAN party places I know of use Metro Ethernet solutions. Gamers like low ping times to their servers, and are willing to spend $$ to get them. So if your target market includes people who play a lot of first person shooters, it may be worthwhile to consider offering a low latency setup for them.