Full frame lets you either collect more light per pixel, achieve a wider field of view, or achieve a narrower depth of focus (more bokeh!) for the same pixel de

Full frame lets you either collect more light per pixel, achieve a wider field of view, or achieve a narrower depth of focus (more bokeh!) for the same pixel density. In general better glass is available on full frame since camera manufacturers produce pro full frame lenses, but infrequently do so with APS-C lenses. There are exceptions, such as Fuji, but in general the best glass is for full frame sensors. Because full frame includes the high end, you can get features on full frame cameras that are not available on APS-C cameras. APS-C's advantage is in lighter, cheaper glass for a given field of view. This is important when hiking! Another option is the m43 format, which has half the sensor area of APS-C, but in turn allows for even smaller and lighter glass and cameras. It's all trade-offs. Full frame sensors will be less noisy and allow for wider fields of view with better quality glass. But you pay for that monetarily and in size/weight. Is the tradeoff worth it to you? Perhaps not. Or perhaps there is a killer feature that is only available on FF cameras from the manufacturer of your choice that you want, so you're willing to pay the monetary and size cost to get it. If you're really after narrow depth of field, low noise, or extremes of pixels, medium format is there and willing to suck as much money up as you've got available.