If you’re starting in one of the next few classes I’d bid SDF75 if you can hold it. There’s only one crashpad in ONT and the past few classes have had a good amount of people get sent to ONT. There may be a empty bed or two still available. The guy who runs it posts in the RST UPS Facebook page when there are available beds.
In addition to that you’ll get a line quicker in SDF than you will in ONT since so many was sent to ONT in the last few classes. A few of us watched classmates in SDF get lines during their second bid period with the company while we spent 8 months on reserve. Once you’re able to hold a line consistently then bid out to ONT. The short commute is nice but reserve is not IMO.