I would say that Spence most definitely punches harder than Porter. He is also more skilled than Porter. If Porter gave Brook a "cold", Spence is going to give Brook the Bubonic plague.
a cold? oh no. porter is more proven than spence at the moment, this eroll hype train will soon be derailed.
Different styles though. Porters style is very messy which doesnt really suit brook. He's much better with guys who fight mid range which errol spence does. Errol tends to step in and get closer as he pushes his opponents back to the ropes but he steps in alot slower than porter. The key for brook Is to not be pushed back to the ropes. Keep it in the centre of the ring