Do you require a floating output? Very few "off brands" offer that.
Probably not because I'm not sure what you are referring to.
A floating output is an output that has an independent ground. Most inexpensive function generator tie their output ground to the unit's power supply ground, which results in that ground effectively being shared across devices in most cases.
Having a floating output can be handy if you need to inject a signal into a part of the circuit that isn't itself ground-referenced (but where some other part of the circuit is), or a part of a circuit where the point where you'd connect the negative side isn't itself ground. If you were to do that with a normal output, you'd end up tying the negative connection point to chassis ground. Needless to say, things can blow up spectacularly if you do that under the right conditions.
Not having a floating output limits where you can inject signals. It must not be too terribly limiting, else I expect we'd see a lot more lower-end signal generators with that capability, but it seems to me that having it would make life quite a bit simpler.