Depending on your definition of 'personality model' there are plenty to choose from.

I don't have any good overview of similarities and differences, which are tests more than models, or which are really two names on the same model.

• Big 5/5 factor model. 5x6 axes. Tests include NEO-PI, MMPI-2, IPIP ++.
• Global 5. 5 axes
• BELBIN
• Emneagram/RHETI
• Hexaco
• Holland COdes/RIASEC
• Jung/MBTI/Kiersey/DISC, 16 PF, MENTI. 4 axes
• MOTIV
• R-Drive
• Temperaments. 4 axes
• Hartman. 4 axes
• Kolb/Mumford
• Learning styles, Grasha­Riechmann styles, Dunn and Dunn styles, Canfield styles

Which ones you should focus on depends on what you are looking for. Big 5\NEO-PI-R is the most scientifically supported model, so I mostly keep to that one. MBTI is useful in learning theory about personality types, differences and traits, but it lacks scientific support. The others I haven't studied much yet. In general I think it's a good idea to use Big 5 as the base, and search for correlations with traits from Big 5.

Sources:

http://similarminds.com/personality_types.html http://tcc.kcc.hawaii.edu/previous/TCC%202005/santo.pdf http://www.personalityresearch.org/bigfive.html http://hexaco.org/scaledescriptions

Depending on your definition of 'personality model' there are plenty to choose from.

I don't have any good overview of similarities and differences, which are tests more than models, or which are really two names on the same model.

• Big 5/5 factor model. 5x6 axes. Tests include NEO-PI, MMPI-2, IPIP ++.
• Global 5. 5 axes
• BELBIN
• Emneagram/RHETI
• Hexaco
• Holland COdes/RIASEC
• Jung/MBTI/Kiersey/DISC, 16 PF, MENTI. 4 axes
• MOTIV
• R-Drive
• Temperaments. 4 axes
• Hartman. 4 axes
• Kolb/Mumford
• Learning styles, Grasha­Riechmann styles, Dunn and Dunn styles, Canfield styles

Which ones you should focus on depends on what you are looking for. 

Big 5\NEO-PI-R is the most scientifically supported model, so I mostly keep to that one. The hard part about Big 5 is the number of traits total (30), which takes a while to really learn, understand and remember. MBTI is useful in learning theory about personality types, differences and traits, but it lacks scientific support. The others I haven't studied much yet. 

In general I think it's a good idea to use Big 5 as the base, and search for correlations with traits from Big 5.

Sources:

http://similarminds.com/personality_types.html http://tcc.kcc.hawaii.edu/previous/TCC%202005/santo.pdf http://www.personalityresearch.org/bigfive.html http://hexaco.org/scaledescriptions

Depending on your definition of 'personality model' there are plenty to choose from.

I don't have any good overview of similarities and differences, which are tests more than models, or which are really two names on the same model.

• Big 5/5 factor model. 5x6 axes. Tests include NEO-PI, MMPI-2, IPIP ++.
• Global 5. 5 axes
• BELBIN
• Emneagram/RHETI
• Hexaco
• Holland COdes/RIASEC
• Jung/MBTI/Kiersey/DISC, 16 PF, MENTI. 4 axes
• MOTIV
• R-Drive
• Temperaments. 4 axes
• Hartman. 4 axes
• Kolb/Mumford
• Learning styles, Grasha­Riechmann styles, Dunn and Dunn styles, Canfield styles

Sources:

http://similarminds.com/personality_types.html http://tcc.kcc.hawaii.edu/previous/TCC%202005/santo.pdf http://www.personalityresearch.org/bigfive.html http://hexaco.org/scaledescriptions

Depending on your definition of 'personality model' there are plenty to choose from.

I don't have any good overview of similarities and differences, which are tests more than models, or which are really two names on the same model.

• Big 5/5 factor model. 5x6 axes. Tests include NEO-PI, MMPI-2, IPIP ++.
• Global 5. 5 axes
• BELBIN
• Emneagram/RHETI
• Hexaco
• Holland COdes/RIASEC
• Jung/MBTI/Kiersey/DISC, 16 PF, MENTI. 4 axes
• MOTIV
• R-Drive
• Temperaments. 4 axes
• Hartman. 4 axes
• Kolb/Mumford
• Learning styles, Grasha­Riechmann styles, Dunn and Dunn styles, Canfield styles

Which ones you should focus on depends on what you are looking for. Big 5\NEO-PI-R is the most scientifically supported model, so I mostly keep to that one. MBTI is useful in learning theory about personality types, differences and traits, but it lacks scientific support. The others I haven't studied much yet. In general I think it's a good idea to use Big 5 as the base, and search for correlations with traits from Big 5.

Sources:

http://similarminds.com/personality_types.html http://tcc.kcc.hawaii.edu/previous/TCC%202005/santo.pdf http://www.personalityresearch.org/bigfive.html http://hexaco.org/scaledescriptions