Elac Vela BS403 vs KEF LS50 Meta

I have LS50 Metas paired with a couple of KC62 subs, but have an opportunity to but a little used pair of ELAC Velas with stands for a good price. 
 

I’ve been happy with my KEFs but sometimes you get the bug to try something different and I have been wondering whether the ELACs would offer me an improvement. 
 

I’d appreciate any thoughts you all might have. Thx.