There is $300 difference in price in these iMac's is it worth spending the extra.
3.4GHz quad-core 7th-generation Intel Core i5 processor
Turbo Boost up to 3.8GHz
8GB of 2400MHz memory, configurable up to 32GB
1TB Fusion Drive1
Radeon Pro 570 with 4GB of video memory
Two Thunderbolt 3 ports
5120-by-2880 P3 Retina 5K display
3.5GHz quad-core 7th-generation Intel Core i5 processor
Turbo Boost up to 4.1GHz
8GB of 2400MHz memory, configurable up to 64GB
1TB Fusion Drive1
Radeon Pro 575 with 4GB of video memory
Two Thunderbolt 3 ports
5120-by-2880 P3 Retina 5K display
3.4GHz quad-core 7th-generation Intel Core i5 processor
Turbo Boost up to 3.8GHz
8GB of 2400MHz memory, configurable up to 32GB
1TB Fusion Drive1
Radeon Pro 570 with 4GB of video memory
Two Thunderbolt 3 ports
5120-by-2880 P3 Retina 5K display
3.5GHz quad-core 7th-generation Intel Core i5 processor
Turbo Boost up to 4.1GHz
8GB of 2400MHz memory, configurable up to 64GB
1TB Fusion Drive1
Radeon Pro 575 with 4GB of video memory
Two Thunderbolt 3 ports
5120-by-2880 P3 Retina 5K display