I got the sidecar bubbler / Mighty + from CCV during the cyber sale, but I think I still prefer this style with the Delta 3 WPA:
Hydro Tube
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The sidecar seems to hit more like a sipper / water pipe (smaller diameter) and I think it's more finicky re: screwing it on to a hot device.
The hydro tube is more durable, larger diameter (more airflow/more bong-like hits) and is easier to place on and off the WPA for clearing the tube / taking a break.
In theory the hydrotube is a little more likely to fall over / off because of it's placement but that's only happened a few times in hundreds of uses...
ETA: and side car is 3X the cost re: inevitable breakage...
ETA2: I guess the biggest plus of the side car is a much lower chance of accidentally getting the oven wet.
YMMV