It's not about where it's made, but where it was developed and which companies are behind them.
The cost of the panel is a fraction of the install cost, from 1/6th to 1/4th of the total cost of an install.
For instance, at wholesale, a Longi 370Wp panel costs less than £100 each.
For your reference: Panneau solaire 370W - MONO - Demi cellules - Longi
So it's worth considering a better panel with 25 years of warranty, labor included.
Also, as in the above video, it's important that the warranty is measured on each panel's performance rather than on an entire array, as a bad panel can be compensated by the rest of the array.
The higher output of a better panel more than makes up for the cost difference.
It will offer less degradation over the years.
What I'm saying is that there are great chances that a Chinese panel will put more money in your installer's pocket for no added benefits to you.
If it saves you big money compared to one of the best brands, then it may be worth considering, but you'll find out that a lot of the Chinese panels are priced at almost the same level as the better brands.
Saving 10% for 20% less output is just not smart.