I find 25g takes forever to push through and when I switched to 23g it’s was much smoother. 1” 23g for pinning and 1.5” 20g for drawing. Have not had a problem with pinning glutes, quads, hips, or delts with 1”. Probably not a big deal for most but when trying to inject glutes it was pretty difficult to turn and hold that position while pushing that oil for over 40 seconds. That’s just me though. 23g made a big difference over the 25g. Also be careful on Amazon- ordered Terumo 23g needles and got an open box of dull Nipro needles. Company never replied but Amazon accepted my return even though I took five needles out to tide me over. Not as good as BD and not even close to terumo. Medsonthego.com and other online stores can be as good or better than Amazon. Hope my 2cents helps. Mobsters advice on another post was spot on regarding gauges and the flow of medicine. Some people may like to push on a syringe for a minute or so.....
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You want luer lock imo.