If you're planning on start mining with either of those I highly advise you to plan ahead. Don't dream big only to realize that the gains will be inferior to any possible liquidity.

Start by making numerous scenarios :

• What hash rate will I get if I buy X GPU's?
• How many power will that system consume?
• How much space (m2) will this system/rig occupy? Do I have the conditions to put it somewhere without being in social areas (lounge area, room, etc)?
  
• How much do I pay for electricity in my area?
• When will I get my investment back? Is it something that I'm comfortable with?

Those are some of the questions that just occurred to me from reading your question. Once you do make the decision then the links shared by BitMaxz are all that you need in order to not being scammed.