what are some of best tonearms you own or experience with.

Some more from the vaults:

Fidelity-Research FR-64s with B60

Fidelity-Research FR-64fx with N60

Lustre GST-801

Victor UA-7082

SME V, still an excellent arm, matches my tt well, is easy to handle and adjust. Before that, Mission 774, Hadcock228, Rega RB300, Alphason HR100S. All fine arms.

G

@yeti42 , The LT is genius. There is an arm under the platform attached to the horizontal bearing axis so it moves with the tonearm. At the end of this arm is a small round neodymium magnet. Under the lift platform is another magnet which has a crescent shape. As the tonearm moves towards the center of the record magnetic attraction keeps the tonearm pointed in the right direction staying tangent to the groove. The real beauty of the design is that it is driven by fiction in the groove pulling the stylus and thus the arm forward. There are no skating forces at all. The only downsides are that it is not a neutral balance arm and it is impossible to get the vertical bearing down at the level of the record.  The CB is a perfect pivoted and offset tonearm. The vertical bearing is down at record level and it is a neutral balance arm. Anti skating is frictionless magnetic. Effective mass is adjustable from 12 to 19 grams In the 9" version. The question is which one is better the CB or LT with it's trade offs.  

Another open-ended question, because one ought at least to reference the cartridge by type and compliance that you intend to use with it.
Of tonearms I own, Triplanar, Reed 2A with Red Cedar wand, and FR64S are the "best". Whoopee.

I am simple so i really like the rega rb900 or rb600 tonearms i have never had one that did not sound wonderful.