plus you have to pay for the electricity/hosting area once you have them
Well you own the gear, and mine whatever pool you want. You can sell miners off / mine alts / lease it out etc... pretty different than this.
With the bitmain offer, you can mine on any pool you want (as long as it is Pool 1-3?). You can sell miners off, but there is $2000 per truck fee, plus logistics. Only 90 days parts/warranty is provided. What happens beyond that? Pay for smart hands (presumably not included in Electricity fee)? Your revenue is based on whatever your miners actually fine.
With AMHash, you can sell your mining contract off on the open market. No logistics issues. Revenue is calculated from hashrate and difficulty, so any availability problems are AMHash's not yours.