ati radeon hd 4250 vs nvidia geforce 8400gt

I have a Sony Vaio fz-440e with Nvidia geforce 8400gt but looking at a newer laptop Acer Aspire 5551-4937 with ATI Radeon HD 4250. I need it for video DJing, for Virtual DJ. These are VDJ min requirements...any help, please? Minimum system requirements: Intel® Pentium® 4 or AMD Athlon™ XP 1024x768 resolution DirectX compatible soundcard 512MB RAM 50MB free on the hard drive RECOMENDED system requirements: Intel® Core™ 2 or AMD Athlon™ X2 1280x1024 resolution Multi-channel DirectX compatible soundcard 1024MB RAM 200MB free on the hard drive Additional requirements for Video mixing: 2048MB (2GB) RAM ATI™ or NVIDIA® video card w/256MB of Dedicated DDR3 RAM Video card must support dual-screen output

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