I like the solia but its the only flat iron I have and it works really well. Sorry this is a long post but I assure you that technic is probably more important than the tool cause you can have a great iron but ugly hair. Also westndianbeauty (spell check) is great at getting her hair straight
Steps I take to flat iron
Clarify hair
sometimes protein treatment
Definately moisturing deep condition as long as possible (overnight is great)
Final rinse with acv
2 choices two dry hair
If I blow dry then I section my hair pulling down as tight as possible to make the hair straight then take the blow dryer and go over it, no comb is needed lose less hair
If I air dry I put in about 10-12 braids; i've been experimenting with flat ironing slightly damp hair and I like it
Finally I flat iron in small section and use either a comb or a brush to "chase" the flat iron down my hair so it gets the ends straight
I put both a leave in and heat protectant on my hair before blow dry cause I like my hair to be a little heavy but you don't have to, and I use rice brand oil as my heat protectant it has a burning point of 450F but I flat iron between 350-370. Hope this helps