Classic or sumo deadlift?

Hi people, in this period i'm trying classic deadlift. Always i do sumo deadlift but when i lift 90% or more my technique is destroyed and i feel the lift too much too difficult, "out of pulling".  Some people says that i pull the sumo like a classic deadlift
This is my last deadlift in competition:
https://www.youtube.com/watch?v=0FvOipyOp6M&list=UUWFtzhh_cYEsuWdN7EbMjEA&index=13

In these days i've tryed to pull raw and light gear a classic deadlift. Raw i feel really better! But geared is really really hard!
This is the classic deadlift video

in order of appearance:
1) classic, 2x185kg (80% of raw deadlift)
2) half sumo (i've also tryed half sumo) 1x200kg (75% of geared deadlift)
3) classic geared deadlift 1x200kg (75% of geared deadlift)
4) half sumo
5) classic

https://www.youtube.com/watch?v=lk4Qg3u2mOc&list=UUWFtzhh_cYEsuWdN7EbMjEA

Even if the video does not appear,  I heard 200 of classic very heavy.

I think that i need some practice, but i don't know if I should change.

What's your opinion?

Thanks a lot.

I don't think your sumo technique is as bad as your described it. I think it looks typical of a lifter with long legs and a short torso. I think it definitely looks better than your conventional technique.

A side view of your sumo deadlift would help to see your back angle during the pull.