Imo: first try making something in O1 or 1095.
If you got the hang of it, switch to pattern welded.
Otherwise you're going to be making your beginner mistakes with that, and those would be expensive mistakes.
“Nothing discloses real character like the use of power. Most people can bear adversity. But if you wish to know what a man really is, give him power.” R.G.Ingersoll