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Obviously XPSK is better for the digital communication technique. Though we have more option for the PSK. Among the all MPSK scheme, QPSK is the most oftern scheme since it does not suffer from bit error degradation while the bandwidth efficiency is increased. Other MPSK scheme increases the bandwidth effiency at the expenses of BER peroformance.
Hope this will help you. If you want to know more about PSK modulation scheme you can Refere book by Fuqin Kiang.
Since different schemes of modulation present trade off relating to each other, we should not analize digital modulation for a isolated point of view. For instance, if you analize bandwidth the M-PSK scheme decrease bandwidth as M increase, but this happens at the expense of degradation in error performance. If you take QAM you will see that for M>=8 it presents a better performance related to 8-PSK regarding power X error performance in spite of the fact that 8-PSK is generally used in sattelite communications since QAM is not suitable for non-linearities in the transmiter-channel-receiver system. Lets be concise, you must consider all the variables involved to decide which squeme is better suited for a given application.
Abrupt phase transitions at PSk can be avoided by using Offset PSK .This should solve the extended response and extra bandwidth for abrupt phase variations .
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