I buy what I want for my growing needs and I have some 1000w mag's that are 12 years old and still run. More on that in a bit. I jumped on the digi band wagon about 5 years ago and had issues with them, blowing cheap bulbs, won't restart when the power goes off and just not working and interfering with my electronic instruments. All the great things they said I found mostly hype, save hydro, no heat bal bla bla. What I found was they get hot, they use just about the same $$ to run and they are 2x the cost of a mag. Now I have heard that they have fixed some issues but a good mag will last 6 years before you should tune it up with a new cap and ignitable (they do degrade over time). So I have 1 1000W digi left and 1 400w out of 6 I bought. I still have all the mags I bought except the 150$ kit ones cheap components. You can tell when you pick a 1000w up it should weigh a ton the cheap one feel like a 400.
Now with a mag about 20% of the power goes to running the box vs a digi 5%.
If you can use a 1000w that's the way to go, plus the cost is less than a 600W and you will increase your yield by 30% = $$$
Rule #1 Buy the best you can afford, mag or digi.
#2 Buy the best bulb you can, use it for 1 year than sell it online for 40$, pays for 1/2 the new bulb.
#3 Both have a higher current draw at start up, the mag way more so don't over load the breaker.
#4 Keep your receipt for a year!!!
#5 Heat kills them put a fan on them.
I buy these now, 110/220 and HPS/MH switchable and they weigh about 45 lbs each. They come like that no cover (heat kills) and the best pats money can buy. I pay 165 for them with cords and light mogul.
I'll wait a year of so before looking at them again.