Thule G5 towbar carriers - 2+1 or 3?

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I'm looking at getting a Thule towbar bike carrier. Think I've decided on the G5, but not sure whether to go for the 3 bike version (909) or the 2 bike version (908) and extra bike adapter.

Does anyone have any experience of either setup?

I think 50% of time I'll only have my bike on there, so the shorter length of the 2 bike carrier would be nice. Or do I just go for the 3 bike version and be done with it?

Will usually be full-sus bikes. Occasionally a couple of roadbikes.

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Thanks for all the advice everyone. Stuck with the 3 bike version in the end - I'd already ordered it from Amazon when I posted, but they were were out of stock which stated me thinking about the 2+1 option. After telling me it wouldn't come for 2 weeks it then turned up the next day. Serious looking and chunky piece of kit isn't it

Only problem now is the weird bummer protector/backplate that the previous owner had fitted with the towbar. It fowls the carrier and the bolts on the towbar ball are stuck fast. Have drenched them in WB40, so will give them another go in the morning.

RRS_Staffs: spotted the hint about the spare +1 carrier - would have mailed you if I'd switched to the 2 bike version.