In general terms does the use of ARM architecture pose any security benefits or risks over other architectures such as x86 and x64?

In general terms does the use of ARM architecture pose any security benefits or risks over other architectures such as x86 and x64?

For example considering that ARM has TrustZone technology, and a potential reduced attack vector because it is based on a simpler RISC (Reduced Instruction Set Computing) based architecture instead of the CISC (Complex Instruction Set Computing) based architecture used by x86 and x64.