IIRC the sidewinder moves the pivot point back 22 inches. So it's about half way between a TT and having the pivot over the rear axle. That would seem to suggest needing less steering input than an over-the-axle pin location, but the pivot point with the sidewinder is closer to the trailer wheels and that amplifies the effect of steering input. Bottom line is you will have plenty of maneuverability. In fact I find that with the Sidewinder it's easy to put in too much steering input. I.e., I've always got more than I need and have to remember to not over do it even with a 169" wheelbase.
Theoretically there is a bit of loss of stability from moving the pivot point back with a sidewinder, but I've never been able to detect it.
You can hook up at any angle, but you must get the pin aligned well when engaging since the 5er will tend to rotate on the tires if there's much resistance to the pin going in. Also, you may not be able to move the sidewinder by hand. If it loosens so that you can move it by hand, it's probably due for a torque wrench on the pivot nut.
For convenience, I'll take the Sidewinder any day.
2020 GMC Denali 2500HD Crew 4X4 Gas 6.6L Rockwood 8280WS (30' 5th)
1000W solar; 322AH LFP battery, 900W PSW inverter, NovaKool RFU9000 12V fridge, CPAP, Inverter microwave.