All James Arthur's performances were absolutely amazing but -
here's My personal top 3 favorites:

#1: Final - Impossible
#2: Week 6 - Hometown Glory
#3: Week 8 - SOS


Here's a list of all the songs:

Audition - Tulisa's Young [0:08]
Performance - How To Safe A Life [2:33]
Performance - You Love Me [4:07]
Week 1 - Stronger [5:34]
Week 2 - No More Drama [8:02]
Week 3 - I'm Sexy And I Know It [10:10]
Week 4 - Sweet Dreams [12:33]
Week 5 - Don't Speak [14:55]
Week 6 - Hometown Glory [17:19]
Week 7 - Can't Take My Eyes Off You [19:40]
Week 7 - Falling [21:50]
Week 8 - SOS [24:12]
Week 8 - Let's Get It On [26:27]
Week 9 - One [28:36]
Week 9 - The Power Of Love [30:54]
Final - Feeling Good [33:10]
Final - Make You Feel Love [36:01]
Final - Let's Get It On [38:51]
Final - Impossible [40:55]