Branches allow for conditions. But allowing for conditions takes up more bits in the instruction. Therefore, a branch’s address is only 2^16 bits and only allows you to branch 2^15 – 1 instructions backward or 2^15 instructions forward.
A jump is unconditional and the bits saved by leaving out the condition can be used for the address. A jump allows for a 26 bit address and so can jump much further in the code than a branch. At the expense of not being conditional.