upsweep and backsweep for mtb handlebars
From my experience upsweep make you pull easier for drops, manuals and bunny hops, but the other side of the medal is shoulder width. The wider your shoulders, the less comfortable will be upsweeped bars (you will feel your hands bent outwards). In fact when chosing BMX bars every degree of upsweep considered as something about a quoter inch of rise (from the ease of pulling perspective).