Read the last 3-4 pages of this thread carefully and then think it through before you leap in.
Bitmain L3 = efficiency + profit but patchy reliability (as with all Bitmain miners - see S9 + R4 subs)
Inno A4's are 100% rock solid, but less efficient as of today. Very soon there's a going to be a new software release coming that will reportedly improve that efficiency 20-25%, so when you factor in 1 board per L3 failing in 6 months, the cost of shipping it back, plus a month of lost mining, and all the work/heartache involved, I know which miners l'd prefer to own.
Disclosure: I have quite a few A4's which hum along for weeks and weeks without me ever touching them, some have been running for 2-3 months now. They occasionally reboot themselves due to the 'get-work' bug but other than that they run like clockwork. And Inno are very responsive and accommodating if you do have problems.
Buying a miner is a long term commitment, it may ROI in a year but how long will it take to return more profit than buy and hold? 3 years? That's a long time to keep something running if it's not 100% reliable.
True, but we still dont know enough about L3's reliability. I think it takes more users and longer periods to declare this or that.
PS - which scrypt coin are you mining? Or are you renting the hash power?