You won't be happy with a 5" screen and side scan. Get at least a 7" screen.
I don't have any experience with the TI units but I did have an Elite unit. I liked everything about the Elite unit except how slow the chart populated. I would move faster with my trolling motor than the chart could refresh on the screen. I would suspect the processor in the TI is still not as fast as the processor in the HDS units. I would hope they are faster than the Elite units. Something you might want to check on if you are planning on using the mapping (which I couldn't imagine not using).
I replaced my 7" Elite at my trolling motor with a (used) 7" HDS Gen 2 unit I bought from eBay. I kept my HDI transducer so I could still have down scan on my HDS unit at the trolling motor. I have never had an issue with the chart refresh on the HDS unit.
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