GL isn't much harder than TOW... Really, the only downside the GL has compared to TOW is range...
The GL actually has a longer remote-detonatable range than the TOW, but while that is an upside in one case "at those ranges" it is a downside, because it has a longer downtime. It is also slower to the target and bounces off surfaces instead of detonating- again, an advantage, but one with a marked ease-of-use aspect.
Walk speed is irrelevant.
Get this man into a Fight Club.
Flak hurts, but all one needs to do is cause a miss and you've immediately decreased their DPS immensely.
Cause a miss by what... dodging? That thing both can do? Besides which, the TOW+Flak combo is more suited to chaining L- and R- dodges and breaking turn caps as you can set it up that one is always up at the end of a dodge-boost sequence. The only weapon than can even remotely to that on the Infil is the Heat Cannon uncharged, which does less damage and is harder to hit. Because of the higher downtime of the GL, you also won't have the staggered uptime of the Flak+Tow combo.
Look, I main the Infil, but if you put me in an Infil against me in a Scout, I'd bet on Scout me in a 1 v 1, barring Infil me getting the drop. If Scout me got the drop, it would be over even faster.