I would say Senegal, they are fairly quiet from what I have read. I don't know if I'd let either one around your budgie tho. I have Cinnamon Green Cheek conure and he's a nippy ******, not exactly a quiet bird either. I hear GCC are good at tricks but mine will do nothing of the sort, is not too fond of humans but is obsessed with my lovebird since their cages are across the way.
This may be just my particular GCC but he is skittish and flighty as well. I also have a Jenday conure who's absolutely lovely, a real cuddle bug, very sociable and friendly but on the louder side, louder than a green cheek. Both the GCC and the Jenday conure are good with tricks. My Jenday conure will lay on his back to get his belly rubbed.
Ultimately, the choice is yours but between those two I would personally pick the Senegal.
This may be just my particular GCC but he is skittish and flighty as well. I also have a Jenday conure who's absolutely lovely, a real cuddle bug, very sociable and friendly but on the louder side, louder than a green cheek. Both the GCC and the Jenday conure are good with tricks. My Jenday conure will lay on his back to get his belly rubbed.
Ultimately, the choice is yours but between those two I would personally pick the Senegal.